Switch Aero System

   
DPSP (Alum 27.2x350mm Black)   +$0.00
OR
We offer two different shapes of aerobar extensions: L-Bends and S-Bends. The L-Bends (or ski-bends) tend to place your wrists in a more ergonomic, comfortable position that's great for long rides and triathlons. The S-Bends let you pull against the extensions effectively for intense time-trial efforts. Not sure which one is best for you? We generally recommend the L-Bend extensions if you're on the fence.

L-Bend Extensions

S-Bend Extensions

Currently, 

the Redshift Dual-Position Seatpost is only offered in one diameter (27.2mm). If your bike has a different seatpost diameter, check out the shim options below to find the right one for your bike.

In addition to the standard black-anodized aluminum post, we also offer an aluminum version with red-anodized linkages, as well as a carbon fiber seatpost with black-anodized aluminum linkages. The carbon fiber post is approximately 60g lighter than the aluminum version.

Different bikes sometimes have different seatpost diameters. The Redshift Dual-Position Seatpost is 27.2mm in diameter, so if your bike's seatpost is larger, you'll need a shim to adapt our seatpost to your bike's frame.  Don't worry though, the shims are super-lightweight and essentially invisible once installed.

Not sure what size seatpost you have currently?  There are a couple different ways to find out.

photo-oct-03-2-11-27-pm-large-optimised.jpg

  1. Most seatposts have the diameter printed somewhere near the bottom of the post.  You'll need to remove the seatpost from the bike frame (mark your existing seatpost height with a bit of tape before you remove it so you can replace it easily), and look for a number like 27.2, 30.9, or 31.6 (etc.).  That is the diameter of the post.
  2. If you know the make, model, and year of your bike, you may be able to look up the seatpost diameter online.  Feel free to shoot us an email at info@redshiftsports.com - we'll see if we can help out!
  3. Ask your local bike shop - they'll be able to accurately measure your bike's seatpost.

Non-compatible posts:  Unfortunately, if your bike's seatpost is smaller than 27.2mm (for example, the 25.4mm posts found on some recent model Cannondale Synapses) our seatpost is currently not compatible with your bike.  Likewise, if you have a bike with an aero/oval/non-round seatpost, or if your bike has an integrated seat mast, the seatpost is also not compatible.

The computer mount for the Quick-Release Aerobars lets you position your bike computer conveniently ahead of your bike's stem.  The computer mount attaches to the underside of the handlebar clamp and remains in place regardless of whether the aerobars are attached or removed.

The Redshift between-the-arms (BTA) water bottle mount lets you carry your hydration comfortably and aerodynamically. Keeping the bottle within easy reach encourages you to drink more frequently, helping you stay hydrated during a race. Multiple different studies have shown that between your arms is the most aerodynamic position to store a water bottle.

Stem Angle

The ShockStop is available in two different angle options: +/-6 degrees and +30 degrees.

In general, you'll find the +30 deg stem provides a more upright, comfort-oriented fit, whereas the +/-6 deg stem puts you in a more performance-oriented riding position (standard for a typical road bike).

The +/-6 deg ShockStop can be flipped so that it's angled slightly upward (+6 deg) or slightly downward (-6 deg). The +30 deg ShockStop should only be installed in the angled upward position.

Stem Length

If you chose the +30 deg ShockStop, then you're all set: its length is 100 mm.

If you chose the +/-6 deg ShockStop, then you will need to choose one of 4 different length options:

- 90 mm = 3.5 inches
- 100 mm = 3.9 inches
- 110 mm = 4.3 inches
- 120 mm = 4.7 inches

Here's some guidance on the length selection:

1) If you are replacing an existing stem and want to match it, then start by seeing if the length is printed on the stem. Choose the length of ShockStop that most closely matches your existing stem's length. If the length is not printed on the stem then go to #2.

2) You can measure the length of your existing stem as shown in the following picture. The length is measured from the center of the handlebar to the center of the steerer tube.

3) Once you determine the length of your existing stem round to the nearest 10 mm and choose the closest match.

4) If you are unable to measure the length of your existing stem then choose 100 mm. This is one of the most common lengths and tends to be a good fit for most people.

There are two different optional mounts available: the Computer Mount, and the Utility Mount:

The Computer Mount is an integrated mount that is compatible with your Garmin, Powertap/CycleOps Joule, CatEye, Mio, or Magellan bicycle computer.

The Utility Mount puts a small section of tube in front of the stem that provides a location to mount anything you would normally put on your handlebar (bike computer, phone, light, etc.).

The ShockStop handlebar clamp is 31.8 mm which is compatible with many modern bikes, without the need for shims. However, some bicycles have different size handlebars which may require the use of shims to fit properly into the ShockStop handlebar clamp. We have shims available for 26.0 mm and 25.4 mm handlebar sizes.

- 25.4 mm is common on bikes with flat handlebars.

- 26.0 mm is common on older road bikes with drop handlebars.

- There are other less common sizes that we do not provide shims for. However, other handlebar shim sizes may be available at your local bike shop.

The easiest way to determine your handlebar size is to see if it's printed on the handlebar. This will require removing your current stem faceplate.

If you can't find the printed size, there are a couple ways you can measure your handlebar:

Best method: Use a pair of calipers to directly measure the diameter or take your bike to the local bike shop and they will be able to measure it for you.

Alternate method: Use a fabric or paper measuring tape (or print one at https://printable-ruler.net/ ) and measure the circumference of the handlebar right next to your existing stem.

- A 31.8 mm handlebar will be 99.9 mm in circumference at the center.

- A 26.0 mm handlebar will be 81.7 mm in circumference at the center.

- A 25.4 mm handlebar will be 79.8 mm in circumference at the center.

Keep in mind that 25.4 and 26.0 mm are very close in size.

If you are not able to measure your handlebar, and you know the make, model, and year of your bike, you may be able to find the handlebar size online at your frame manufacturer's website.

The Computer Mount is an integrated mount that is compatible with your Garmin, Powertap/CycleOps Joule, CatEye, Mio, or Magellan bicycle computer.

The Computer Mount is compatible with the Garmin Edge 1000 in portrait orientation only when mounted in the upper mounting position on the stem faceplate. In the lower mounting position, it is compatible with the Edge 1000 in landscape orientation, but may not be able to be quick-released using the standard quarter-turn.

The ShockStop handlebar clamp is 31.8 mm which is compatible with many modern bikes, without the need for shims. However, some bicycles have different size handlebars which may require the use of shims to fit properly into the ShockStop handlebar clamp. We have shims available for 26.0 mm and 25.4 mm handlebar sizes.

- 25.4 mm is common on bikes with flat handlebars.

- 26.0 mm is common on older road bikes with drop handlebars.

- There are other less common sizes that we do not provide shims for. However, other handlebar shim sizes may be available at your local bike shop.

The easiest way to determine your handlebar size is to see if it's printed on the handlebar. This will require removing your current stem faceplate.

If you can't find the printed size, there are a couple ways you can measure your handlebar:

Best method: Use a pair of calipers to directly measure the diameter or take your bike to the local bike shop and they will be able to measure it for you.

Alternate method: Use a fabric or paper measuring tape (or print one at https://printable-ruler.net/ ) and measure the circumference of the handlebar right next to your existing stem.

- A 31.8 mm handlebar will be 99.9 mm in circumference at the center.

- A 26.0 mm handlebar will be 81.7 mm in circumference at the center.

- A 25.4 mm handlebar will be 79.8 mm in circumference at the center.

Keep in mind that 25.4 and 26.0 mm are very close in size.

If you are not able to measure your handlebar, and you know the make, model, and year of your bike, you may be able to find the handlebar size online at your frame manufacturer's website.

  • Description
  • Technical Specs
  • Reviews
  • FAQ
  • Instructions
  • Testimonials
  • The Redshift Switch Aero System let you ride a true, optimized aero position on a road bike, without sacrificing your standard road setup. The patent-pending Quick-Release Aerobars attach and remove in a few seconds without any tools, letting you choose the best setup for each ride. And once you're on the road, the patent-pending Dual-Position Seatpost lets you switch between road and aero saddle positions on-the-fly while you ride. Together, they let you choose the best riding position for every situation.

    Quick-Release Aerobar Features:

    • Quick-release mechanism allows you to attach or remove aerobars in a few seconds.
    • No tools required to remove or attach the aerobars.
    • Aerobars always attach in the same orientation.
    • Extensions are available in aluminum and carbon, as well as L-Bend or S-Bend shapes.
    • Secondary safety release mechanism prevents accidental release.
    • Massive adjustability lets you fine-tune your fit - height, extension length, armpad fore-aft, armpad width.

    Dual-Position Seatpost Features:

    • Linkage design lets you switch between road and aero positions seamlessly on-the-fly while riding.
    • Choose the best position for every single climb, flat, or descent.
    • Linkage design maintains proper leg extension in both road and aero positions.
    • Saddle moves forward 50mm, corresponding to approximately  4 degrees of effective seat tube angle change.
    • Aero road riding position optimized for proper handling on a road bike.
    • Differential saddle tilt adjustment allows up to 5 degrees additional nose-down saddle tilt in aero position vs road position.
    • Simple, durable two-bolt saddle clamp allows infinite saddle tilt adjustment and reliable clamping.
    • 16mm rearward setback (road position).

    The Switch Aero System package contains the following:

    • 27.2mm diameter Dual-Position Seatpost
    • Aerobar Handlebar Clamps
    • Quick-Release Aerobar Mechanisms
    • Aerobar Extensions, Armrest, and Armrest Pads
    • Aerobar Stack Spacers (4 x 13mm tall) and associated hardware
    • 26.0mm to 31.8mm Handlebar Shims for Aerobars
    • All required hardware


  • Quick-Release Aerobars

    Weight630 g/pr Aluminum S-bend
    640 g/pr Aluminum L-bend
    564 g/pr Carbon S-Bend
    570 g/pr Carbon L-Bend
    Pad Height (A)
    Minimum - 75 mm
    Maximum - 98 mm (with two stack spacers)
    Pad Setback (B)Minimum - 30 mm
    Maximum - 81 mm
    Pad Width (C)
    Minimum - 108 mm
    Maximum - 165 mm
    Extension Length (D)
    362 mm S-bend
    368 mm L-bend
    Extension Rise (E)
    50 mm S-bend
    100 mm L-bend
    Extension Diameter (F)
    22.2 mm (compatible with industry-standard extensions)
    Handlebar Clamp Width (G)
    22 mm
    Handlebar Diameter
    31.8 mm compatible
    26.0 mm compatible (using included shims)
    Material
    6061-T6 aluminum
    Rider Weight Limit
    115 kg (250 lb)

    Dual-Position Seatpost

    Weight400 g - Aluminum 27.2 mm x 350 mm
    340 g - Carbon 27.2 mm x 330 mm
    Seatpost Diameter (A)
    27.2 mm
    Seatpost Length (B)
    350 mm - Aluminum (bottom to clamp centerline)
    330 mm - Carbon (bottom to clamp centerline)
    Minimum Insertion (C)75 mm - Aluminum
    65 mm - Carbon
    Rearward Offset
    Road Position (D)
    16 mm
    (post centerline to clamp centerline)
    Forward Offset
    Aero Position (E)
    34 mm
    (post centerline to clamp centerline)
    Total Travel
    Road to Aero Position
    50 mm
    (3-4 degrees effective seat tube angle change)
    Saddle Rail CompatibilityStandard 7 mm round saddle rails only
    MaterialLinkages & saddle clamps - 7075 T6 aluminum
    Aluminum post - 6061 T6 aluminum
    Rider Weight Limit115 kg (250 lb)

  • Reviews in the Press

    DC Rainmaker

    In-Depth Review of the Redshift Sports Switch Aero System

    "Overall, I'm really impressed with the Redshift system. It performs exactly as you’d anticipate and does so without any issues. The fit flexibility of the system is on par with most aerobar systems on the market, yet with the significant added benefit of being able to remove the aerobars on demand. Meanwhile, the seatpost is highly unique in the market and fills the gap for folks wanting to be able to maintain a better fit across both road and triathlon positions."

     

     

     

    Triathlete Magazine

    2016 Buyer's Guide

    "Redshift launched its Quick-Release Aerobars a few years ago, and they remain a great option for people looking to outfit their road bikes with aerobars. The bars are ideal for the athlete who owns just one bike and uses it for both group rides and triathlon. You can install or remove the bars in seconds without compromising a fine-tuned fit. Even without the quick-release feature, these bars would be near the top of our list—they are well made and have a ton of fit adjustability."

     

     

     

    Triathlete Magazine

    June 2014 Review

    "The Switch Aero System allows a single road bike to comfortably accommodate an aerodynamic position while preserving the road position...We tested the system on the road and found the two-position seatpost to be very secure. It never accidentally shifted between settings, even over rough roads. The aerobars are comfortable and, despite the quick release, felt as solid as any ordinary clip-on."

     

      

     

    Triathlete Magazine

    2014 Buyer's Guide

    "These bars will make life much more convenient for athletes who want to install aero bars on a road bike for racing and solo training but want to remove them before a Saturday group ride."

     

      

     

    ERO Sports

    Aero Testing the Switch Aero System

    "There's no doubt the Switch Aero System is beneficial to anyone who wants to place aero bars on their road bike. Both biomechanically and aerodynamically, it makes perfect sense. For bike fitting, it takes the headache away from doing so, and it could very well be a better, faster solution for climb-heavy triathlons. Setup is easy, quality is high, and there's no doubt a benefit to using the Switch Aero System. ERO highly recommends it's use."

     

       

    Other Reviews

    LA Times
    Gear Patrol
    220 Triathlon
    Road Bike Review

     
  • Quick-Release Aerobars

    How do aerobars affect my bike fit?

    This is a really important question, and it's one that we've spent a lot of time thinking about here at Redshift Sports, so get ready for a long answer!

    Aerobars (of any brand) work by rotating your upper body forward so that it is more parallel to the ground, and therefore less exposed to air resistance (imagine sticking your hand out a moving car window with your palm facing forward vs. with your fingers facing forward). If you don't change your saddle position when moving from road to aero positions, the angle between your thigh and your torso (otherwise known as the "hip angle") becomes tighter at the top of your pedal stroke, since your knees are effectively coming closer to your chest as you lower your upper body. For most riders, the tighter hip angle is uncomfortable and can actually reduce power output because you end up fighting against your body's own range of motion to move your leg over the top of the pedal stroke. It can cause back pain and generally leads to a riding position that is unsustainable, particularly for longer distance events.

    The other unintended consequence that occurs if the saddle position is not adjusted is that the aerobar armpads tend to be too far away to reach comfortably. You end up riding in a "superman" position with your arms extended too far forward, which puts a lot of stress on the supporting muscles of the arms, shoulders, and core.

    We specifically designed the Quick-Release Aerobars along with the Dual-Position Seatpost specifically to address this issue. The Dual-Position Seatpost addresses the fit implications of riding with aerobars on a road bike by allowing the saddle to move forward with the rider when shifting from road to aero riding positions. This forward movement effectively rotates the rider's body around the bottom bracket (where the pedals attach), naturally lowering the upper body down onto the aerobars without compressing the rider's hip angle. The forward movement also positions your body comfortably and efficiently over the aerobar armrest pads, letting you support your upper body through your skeleton, rather than relying on muscles.

    Together, the Quick-Release Aerobars and Dual-Position Seatpost provide an optimized aero riding position that allows you to ride efficiently, comfortably, and powerfully on your road bike in both road and aero positions.



    Should I choose L-Bend or S-Bend extensions?

    If you don't have any previous experience using aerobars, we typically recommend the L-Bend aerobars because they put your wrists and arms in a more comfortable, ergonomic position. This is usually a better fit for triathletes and long-distance riders. If you're planning on using the aerobars for shorter, higher-intensity efforts like a time-trial, then the S-Bend shape can give you slightly more leverage to put out maximal power.



    How do I attach or remove the aerobars?

    Check out the instructional videos on the Instructions tab for step-by-step guidance on attaching and removing the aerobars.



    What adjustments can I make to the aerobars?

    Redshift's Quick-Release aerobars are incredibly adjustable. You can adjust the following characteristics to fine-tune your fit.

    - Extension reach and roll
    - Armrest pad fore-aft position
    - Armrest pad width
    - Armrest pad rotation
    - Aerobar stack height (spacers included)
    - Aerobar tilt

    For a full range of adjustment dimensions, check out the Technical Specifications tab. Check out the Instructions tab for step-by-step instructional videos covering each adjustment.



    Will the aerobars fit non-round (aero-shaped) handlebars?

    The handlebar clamps for the Quick-Release Aerobars need at least 22mm (7/8 inch) of straight, cylindrical handlebar on either side of the stem to clamp properly. Some aero-shaped handlebars have a sufficiently wide cylindrical section in the center of the handlebar to properly mount clip-on aerobars. However, some handlebars are ovalize or tapered within the clamping region. In this case, Redshift aerobars (or any clip-on aerobars) will not be compatible since they will not clamp securely on the non-round handlebar.



    Do the armrest pads flip up?

    The armpads on the Redshift Quick-Release Aerobars do not flip up. We decided that the small added benefit of flip-up armrests was not worth the additional complexity, weight, and cost that would be required. Most riders choose to simply rest their hands on the armrest pads instead of the bar tops. If both height spacers are installed, it is also possible to slide your hands underneath the armrest pad and grip the bar top directly.



    What kind of testing do you do to qualify the aerobars?

    All Redshift Sports components are tested to the latest ISO 4210 standard for Racing Bicycles. These standards typically specify "Static Strength" tests (i.e. one-time application of force) as well as "Fatigue" tests (i.e. repeated application of force) for different bicycle components. We also run our own independent tests to better understand lifespan which typically involve cycling well beyond the specifications in the ISO 4210 standard.



    Are the Redshift Quick-Release Aerobars legal to use in a triathlon race?

    Yes! The Redshift Quick-Release Aerobars are legal for use in any non-drafting triathlon. That includes all Ironman events, USAT sanctioned events, and the vast majority of triathlons worldwide. The only events where our aerobars are not permitted are draft-legal events, which are relatively uncommon. If you're wondering about a specific race, shoot us an email at support@redshiftsports.com and we'll help you figure it out.



    Is the quick-release mechanism secure?

    Absolutely. We spent a huge amount of time refining the quick-release mechanism to make sure that it is rock-solid when the aerobars are attached. When tightened properly, the quick-release aerobars are indistinguishable from standard aerobars in terms of feel and performance. The design also features a patent-pending secondary safety latch which prevents accidental release of the aerobars if you forget to tighten the clamp properly. For more details on how to properly tighten the clamp checkout the videos in the "instructions" tab on this page.



    What is the difference between the aluminum and carbon aerobars?

    The only difference between the two different models is the material of the extension itself. The aluminum versions have aluminum extension tubes, while the carbon versions have carbon fiber extension tubes. All of the quick-release hardware, handlebar clamps, and other parts are identical between the two versions. Functionally, the only difference between the materials is weight - the carbon fiber versions will weigh approximately 60-70 grams less than the aluminum versions. They also look cool because, well, they're carbon.



    Are the quick-release aerobars compatible with my carbon handlebar?

    Most likely. Redshift Quick-Release Aerobars are generally compatible with carbon fiber aerobars, as long as there is at least 22mm (7/8 inch) of straight, cylindrical handlebar on either side of the stem to clamp properly. However, there are some manufacturers of lightweight equipment that specifically prohibit the use of clip on aerobars (of any type, not just Redshift's). We recommend that you check with you handlebar manufacturer to make sure that your handlebar is compatible. As always, with carbon components, it is critical to use a torque wrench while installing the handlebar clamps. Improper clamping torque can crush or otherwise damage your handlebar, which could result in serious injury.



    Can I mount gear shifters on my aerobar extensions?

    Yes, with some qualifications. The extensions are industry-standard 22.2mm diameter that will fit most standard bar-end type shifters designed for aerobars. However, because the aerobars are quick-release, we do not recommend the use of standard cable-actuated gear shifters, since they would effectively tie the aerobar to the bike and defeat the quick-release functionality. If your bike has electronic shifting (either Shimano Di2 or SRAM eTAP), then you can usually unplug the extension-mounted shifter from the junction box when you remove the aerobar, which is a great option.



    Will riding with aerobars compromise my bike's handling?

    Nope. We specifically designed the Quick-Release Aerobars in conjunction with the Dual-Position Seatpost to provide an optimized riding position on a road bike. Obviously, riding in aerobars is different than riding on the normal handlebars - you don't have immediate access to the brakes, and steering is accomplished primarily via body leaning vs direct steering input. If you're new to riding in an aero position, it may feel strange for a few rides, but you'll quickly get the hang of it. As with anything new, we recommend starting out on a safe, straight road with minimum car and pedestrian traffic, at least until you get the feel for riding in the aero position.



    How much faster will I ride with aerobars?

    Great question! Obviously, individual results will vary based on your particular bike, setup, and body, but most people can expect to ride 1-1.5 mph (1.5-2.5 kph) faster at the same power output when you ride in the aero position (vs. riding with your hands on the hoods). That translates to roughly 5 minutes saved during an Olympic-distance triathlon, 11 minutes in a half-Iron distance, and 22 minutes in a full Ironman!



    Can I use another manufacturer's aerobar extension with your quick-release mechanism?

    Redshift Quick-Release Aerobars have industry-standard 22.2mm diameter extensions, which means that they are compatible with many other aerobar manufacturers' extensions, including Profile Design and Zipp. However, there are number of manufacturers who use non-standard proprietary extension diameters which won't be compatible. If you're not sure, contact us at support@redshiftsports.com and we'll help you figure it out.



    Dual-Position Seatpost

    Why does the seatpost need to move?

    This is a really important question, and it's one that we've spent a lot of time thinking about here at Redshift Sports, so get ready for a long answer!

    Aerobars (of any brand) work by rotating your upper body forward so that it is more parallel to the ground, and therefore less exposed to air resistance (imagine sticking your hand out a moving car window with your palm facing forward vs. with your fingers facing forward). If you don't change your saddle position when moving from road to aero positions, the angle between your thigh and your torso (otherwise known as the "hip angle") becomes tighter at the top of your pedal stroke, since your knees are effectively coming closer to your chest as you lower your upper body. For most riders, the tighter hip angle is uncomfortable and can actually reduce power output because you end up fighting against your body's own range of motion to move your leg over the top of the pedal stroke. It can cause back pain and generally leads to a riding position that is unsustainable, particularly for longer distance events.

    The other unintended consequence that occurs if the saddle position is not adjusted is that the aerobar armpads tend to be too far away to reach comfortably. You end up riding in a "superman" position with your arms extended too far forward, which puts a lot of stress on the supporting muscles of the arms, shoulders, and core.

    We specifically designed the Quick-Release Aerobars along with the Dual-Position Seatpost specifically to address this issue. The Dual-Position Seatpost addresses the fit implications of riding with aerobars on a road bike by allowing the saddle to move forward with the rider when shifting from road to aero riding positions. This forward movement effectively rotates the rider's body around the bottom bracket (where the pedals attach), naturally lowering the upper body down onto the aerobars without compressing the rider's hip angle. The forward movement also positions your body comfortably and efficiently over the aerobar armrest pads, letting you support your upper body through your skeleton, rather than relying on muscles.

    Together, the Quick-Release Aerobars and Dual-Position Seatpost provide an optimized aero riding position that allows you to ride efficiently, comfortably, and powerfully on your road bike in both road and aero positions.



    How do I move from the road to aero position (and vice versa)?

    Moving the Dual-Position Seatpost between positions is incredibly simple and can be done in a few seconds while riding. To move the saddle forward from road to aero position, simply unweight the saddle, grab the nose of the saddle between your legs, and pull up and forward firmly.


    To move the saddle backward from aero to road position, simply squeeze the saddle between your thighs, and push up and backward with your legs.



    Is there a lock or release button? What keeps the saddle in place?

    The main thing that keeps the Dual-Position seatpost locked in either position is your body weight. In order to move between positions, the linkage has to move upward first, so as long as your weight is resting on the saddle, the linkage cannot change positions. There is also a strong spring detent that holds the linkage firmly in position if you're out of the saddle.



    Will the seatpost linkage move accidentally while I'm riding?

    No. We spent a lot of time optimizing the linkage design to eliminate the possibility of unintended motions, while still making it easy to switch positions. Once you are accustomed to how much rearward pressure is required to move from aero to road position, unintended shifts are virtually nonexistant.



    Will the Dual-Position Seatpost fit my aero/non-round seatpost?

    Unfortunately, the Dual-Position Seatpost currently only fits standard round seatposts that are 27.2mm or larger in diameter. The reality is that every model of aero bike has a different shaped seatpost, meaning that it is impossible to create a post that will work with every bike. We are planning to make a few brand-specific versions for Trek and Cervelo bikes, but we do not currently have a timeline for release of those products.



    Will the Dual-Position fit my Trek Madone/Domane/Emonda?

    If your Trek has a standard type seatpost (male post fits into a female hole in the frame), then the dual-position seatpost will fit your bike. However, if your bike has a "Ride-tuned Seatmast" (commonly found on higher-end Madone/Domane/Emonda models, then it is not compatible with your bike. The good news is that we are actively working on a version of the Dual-Position Seatpost that is compatible with the Ride-Tuned Seatmast, but we do not currently have a target release date for that product.



    My bike has a 25.4mm seatpost. Will the Dual-Position fit?

    Unfortunately, the Dual-Position Seatpost will currently only fit bikes that have seatpost diameters of 27.2mm or larger. The good news is that we are currently developing a 25.4mm version of the post and will update this FAQ as soon as we have a target release date for that product.



    What saddle should I use to ride in the road and aero position?

    Saddle choice is an extremely personal choice - what works well for one person may be terrible for another person based on differences in anatomy and riding style. Our suggestion is to find a good local bike shop that has a saddle demo program and try out several different models during actual long rides. It is impossible to tell whether a saddle will work well for you in a store, and even on a single ride, since it often takes several rides to become accustomed to the new saddle. Online retailers like Trisports.com have mail-order saddle demo programs if you don't have access to a local bike shop.



    Do I need a shim for my frame?

    If your seatpost is 27.2mm in diameter, you won't need a shim, but if your current seatpost is larger than 27.2mm (common sizes include 30.9 and 31.6mm), you'll need a shim to fit the seatpost properly in your frame. We sell a variety of shims which you can add to your order.



    What's the deal with the carbon seatpost?

    We had a small production run of carbon seatposts that we produced in 2015, but we weren't happy with the production process and associated costs. We're currently in the process of setting up a new manufacturer for the carbon seatposts and hope to have them available later this year.



    How far does the seatpost move between road and aero positions?

    The Dual-Position Seatpost moves 50mm between the road and aero positions. The linkage is designed such that the bottom bracket to saddle distance remains the same, ensuring proper leg extension in both riding positions. As a result of this, the saddle will actually move up approximately 12mm (relative to the ground) as it moves forward from road to aero position.



    What kind of testing do you do to qualify the seatpost?

    All Redshift Sports components are tested to the latest ISO 4210 standard for Racing Bicycles. These standards typically specify "Static Strength" tests (i.e. one-time application of force) as well as "Fatigue" tests (i.e. repeated application of force) for different bicycle components. We also run our own independent tests to better understand lifespan which typically involve cycling well beyond the specifications in the ISO 4210 standard.



    Will the Dual-Position Seatpost fit a Shimano Di2 battery inside?

    Yes, the standard "lipstick" style Shimano Di2 battery will fit inside the seatpost. However, keep in mind that the inner diameter of the seatpost is ovalized, so standard round battery mounts may not be compatible. We have found that wrapping the battery with a thin layer of packing foam is usually sufficient to secure the battery within the seatpost.



    Is the Redshift Dual-Position Seatpost legal to use in a triathlon race?

    Yes! The Dual-Position Seatpost is legal for use in any non-drafting triathlon. That includes all Ironman events, USAT sanctioned events, and the vast majority of triathlons worldwide. The only events where the seatpost is not permitted are draft-legal events, which are relatively uncommon. If you're wondering about a specific race, shoot us an email at support@redshiftsports.com and we'll help you figure it out.



    What is the effective setback of the seatpost?

    In the road position (rearward position), the seatpost has 16mm of rearward setback. In the aero position (forward), the saddle clamp is offset 34mm forward of the seatpost centerline.



    What is the weight limit for the seatpost?

    The rider weight limit for the Dual-Position Seatpost is 115 kg (250 lb).



    Will riding with a forward saddle position compromise my bike's handling?

    We specifically designed the Dual-Position Seatpost to provide an optimized riding position on a road bike. If you're new to riding in an aero position, it may feel strange for a few rides, but you'll quickly get the hang of it. As with anything new, we recommend starting out on a safe, straight road with minimum car and pedestrian traffic, at least until you get the feel for riding in the aero position.



    How do you ensure proper bike fit in both the road and aero positions?

    The linkages geometry of the Dual-Position Seatpost was specifically designed to provide an optimized aero riding position on a road bike. Starting with your existing road saddle position, the linkage maintains the same bottom-bracket-to-saddle distance in the aero position, allowing you to ride with proper leg extension in both positions. Furthermore, we intentionally chose the amount of forward travel to provide a comfortable, efficient, aerodynamic aero riding position, without moving so far forward as to compromise the handling of your bike in the aero position.



    Will my saddle bag fit with the Dual-Position Seatpost?

    Most standard strap-based saddle bags will fit the dual-position seatpost without issue. You may need to loosen the straps slightly to accommodate the movement that occurs between road and aero positions. If your saddle bag uses rigid clips, clamps, or some other inflexible attachment method, it's possible that your bag may not be compatible. If you have questions about your specific bag, don't hesitate to reach out to us at info@redshiftsports.com and we'll help you figure it out!



    Can I adjust the saddle position independently in the road and aero positions?

    The amount of forward travel of the seatpost is fixed at 50mm, so the two positions are not independently adjustable. For most riders, we recommend that they duplicate their existing road saddle position (assuming that you are happy with your road fit), and then the Dual-Position Seatpost will automatically provide an optimized aero saddle position.

    However, there is one aspect of the fit that can be adjusted independently. The seatpost includes a differential saddle tilt adjustment that allows you to dial in up to 5 degrees of additional forward saddle tilt in the aero position vs. the road position. Some riders prefer that the saddle be rotated slightly forward in the aero position because their hips are rotated further forward.



    Does the Dual-Position Seatpost feel different than a regular seatpost?

    Not really. When you're riding in either position, the seatpost is indistinguishable from a standard seatpost. However, the ability to change positions during a long ride makes a huge difference in comfort that you'll undoubtedly notice.



    Will the pivots develop play over time?

    We spent a lot of time designing and testing the pivots and linkages to ensure that they would remain rock solid throughout the life of the product. We specifically chose the material of the shaft and pivot bushings to provide outstanding resistance to wear.



  • Download Instructions (PDF)

    Instructions - Quick-Release Aerobars

    Instructions - Dual-Position Seatpost


    Installing Handlebar Clamps




    Attaching & Removing QR Aerobars




    Adjusting Armpad Position


  • Customer Testimonials


    "I recently purchased a Redshift Dual-Position Seatpost and I wanted to let you know how happy I am with it. I feel it is truly a revolutionary product. I often switch between a forward position on my aerobars and a rearward road-riding position (for hills or just to vary my position for comfort), but until now I was never able to get into the ideal position for either type of riding, without having to get off the bike and adjust the saddle and seatpost every time-a pain in the neck. The Dual-Position Seatpost changes all of that. I can adjust my position instantly on the fly with no compromise in either position. And to be able to set up the seatpost so there is a different forward tilt for each position is icing on the cake, as I like to have the nose down a little in the TT position, and level in the road-riding position. Brilliant!

    To put into perspective just how great I feel this is, my bike has Shimano Di2 electronic shifting, and I consider Di2 to be the top cycling-related invention of the past 10 years. For me, the Dual-Position Seatpost is a close 2nd!"

    - Jon S.

     

    "I just wanted to write a quick note and say thank you for excellent customer service and of course such an awesome product. I have been thoroughly enjoying the seat post and aero bars since day 1 that I received them. Stephen, thanks again for answering my millions of questions and putting up with me!" 

    - Woody B.

     

    "A little feedback.  I did a 10 mile TT last night with the local cycling club. I have only done one before and I was a full minute faster than before. Some of the improvement will be conditioning but the bulk is probably from positioning. Conditions were not ideal and most riders were slower than usual.

    Also, last weekend I did 2 x 31 Km laps of our local half ironman course (we call it the Ireman). The first lap in a road bike position. Second lap on the new set up (but not always on the aero bars because of hills, traffic, junctions etc). I did not take a break between laps and would normally slow by 2-3 % at a set heart rate. The second lap was nearly 2 minutes faster than the first lap, at the same heart rate and a slightly lower power output. (0.9 Km/Hr faster on the second lap). Not too shabby, as we say here ..."

    - Neil C.

     

    "Very impressed! Loved the ease of toggling back and forth between road and aero position. Positioned me perfectly for minimum drag and max bio mechanical advantage. Awesome!"

    - Frank C.

     

    "I love the ease of removing the aero bars and the confidence knowing that the position is exact when installed back on the bike. Did I mention how simple the bars are to take on and off, 2 seconds max? I’m new to road biking and Triathlon and wasn’t sure if I could justify a second bike for Tri’s, so glad I bought this set instead. Only thing is I forget to switch the seat back and forth, never had that option before. (Maybe redshift can engineer a little butt poker when you drop into aero position it reminds you to shift the seat, LOL)."

    "I did my first Triathlon July 4th weekend and as I was setting up the Bike I forgot the aero bars in the car, ran back got them popped them on and had 2 people come check it out they were amazed how simple and no tools needed to take them on and off. Good quality and great product. I love mine."

    - Shane N.

     

    "I've had the Switch Aero System since launch and must say I'm very pleased with it. Some may know the history of this project, others may not, but life began as a kickstarter project. With kickstarter projects, there's always the worry that the initial product may have some issues, since widespread testing can't really be done until it gets into the hands of the users. Well worry not; the system is solid. The fit and finish is good, all the parts fit together nicely."

    "I am very happy with the Switch system. As someone who spends most his time road riding, with only 3-4 triathlons a year, it was hard to make a strong enough case in the "court-of-the-significant-other" for a dedicated Tri bike. I have an appeal pending; until then... I use the Switch system for Tri training and racing; having just recently completed my first OLY with it. I have had no issues and it was easy to setup. The two inconspicuous quick release mounts stay on my road bike's handlebars at all times, but they're rarely noticed by anyone other than a bike tech-head."

    "The movable seatpost is fantastic. I run an ISM Adamo Road saddle on it. One of my favourite aspects about the movable seatpost is that if I need to climb a very large hill, I can easily shift my position mid-race back to a more normal road-riding setup; spin up the hill and then just "click" (or switch - hehe) back into the aero position and power on. I also found cockpit setup relatively straightforward. The only thing to be aware of is that you'll need to run your seatpost what seems to be much lower than you normally might because the mechanism at the top takes up a lot of space - so it's an illusion, but something to note. For completeness' sake, I have the carbon S-bends and am very happy with them."

    "Overall, I really couldn't be happier and I tend to be extremely critical of everything I use."

    - Amazon Reviewer

     

    "Just got the Aero system on the website, delivered to Ireland. I have to say I am well impressed. I just took 8 minutes off my 40K time. The same Bike, Same Conditions, Same route, same rider (Although a bit more tired this week after after running a 5k this morning). Last week I had got my time to the best ever. This week with your product I have shaved 8 more minutes off my time, and to be honest far less effort. Well Done Redshift! Super product!"

    - Don R.

     

    "I wouldn't normally write a review, but this has easily been the best purchase I have ever made for my bike - both the product and the service, so would really like to provide my thanks."

    - Peter S.


    "In short I love it. [And] after seeing how well it was engineered I decided to go ahead [and buy the ShockStop].

    I just have to comment on my first experience, a short 37km ride on my dual seat post. I'm sure you'll have heard this before, but it really was like switching bikes enroute. Absolutely amazing feeling of power when on the bars in aero. I originally put bars on my bike to give position options while riding. (I used to get pins and needles in my hands and the bars gave me an option to avoid them). What I didn't know was how much power I was giving up in the then bent over position. I just can't believe the new feeling of power in this new riding position. I'm sure in time familiarity will lessen the awareness, but right now I feel like I have a completely new ride. When I consider all the alterations to gear I have made on my bike over the years, without doubt the single most significant difference I've made. Every road bike should have one.

    Would I recommend [it]? – Hell yes!! [The seatpost has] fundimentally changed my ride for the better. Being able to flip between Aero and Road positions is so enjoyable and with the comfort evolving from the stem technology, well it makes for a significantly improved and pleasurable experience."
    - Noel M., New Zealand


    "I tell all of my friends about your product and want you to know that you have enhanced my life! I have back injuries that used to significantly reduce my time on the bike. The adjustable seat position helps me get into aero but most importantly helps me adjust my riding position which allows me to ride distances again that simply wouldn't be possible without your product."

    - Matt S., USA