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.
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.
Preorder ships January 10, 2020
The patent-pending ShockStop Suspension System combines the ShockStop Seatpost and ShockStop Stem for the ultimate bump-eating comfort. 20mm of front suspension and 35 mm of rear suspension let you float over rough terrain - ride further, faster, and more comfortably on the bike you already own. The minimal, subtle design blends seamlessly with the aesthetic of modern gravel, road, and e-bikes.
ShockStop Suspension Stem:
ShockStop Suspension Seatpost:
Weight | 264 g +/-6 deg, 90mm 274 g +/-6 deg, 100mm 286 g +/-6 deg, 110mm 298 g +/-6 deg, 120mm 274 g +30 deg, 100mm |
Steerer Clamp Diameter (A) | 1-1/8 inch (28.6 mm) |
Handlebar Clamp Diameter (B) | 31.8 mm |
Effective Travel | Up to 20mm on drop-bar road bike. Up to 10mm on flat-bar road bike. |
Material | 6061 T6 aluminum |
Rider Weight Limit | 135 kg (300 lb) |
Steerer Tube Clamp Stack Height | 40mm |
Diameter | 27.2 mm (shims available) |
Length | 350 mm (14 in) |
Suspension Travel | 35 mm (1.4 in) |
Rearward Offset | 7 mm (0.25 in) |
Rearward Offset (@ 25% travel) | 12 mm (0.4 in) |
Spring Preload | User Adjustable |
Weight | 497 g (17.5 oz) |
Rider Weight Limit | 110 kg (242 lb) |
Material | 6061 T6 Aluminum Alloy |
Saddle Rail Compatibility | 7mm round & 7x9mm oval |
Di2 Battery Compatibility | Yes (requires mount kit) |
"I’m kicking myself for not installing this sooner."
"My first ride on the ShockStop was an eye opener. Benefits were immediately apparent; it took the edge off direct root impacts, even with the already forgiving ... gravel tires taking the brunt of it. Dropping off curbs and nailing potholes yielded equally pleasing results ... I have no plans to take it off."
"A great option for transforming a harsh ride into a smooth, fatigue-reduced cruise, while looking discreet"
"...we are believers."
"Not only does the ShockStop work, it works as well or better than any current road or gravel suspension setup - and for a fraction of the cost without cluttering up the bike’s lines. It's also compatible with any bike that uses a standard stem, making it one of the simplest and cheapest ways to add suspension to an existing platform"
"[it] offers noticeable shock absorption in the rough stuff, and yet doesn’t produce any annoying bounce during sprinting or climbing."
"It does not twist or have overt movement when riding straight or cornering. The damping quality for small vibrations is subtle, but with harder hits, roots and rocks and drops, the stem goes to work taking the edge off the bumps ... and it does not incur much of a weight penalty."
"This is a game changer..."
"The Redshift Sports ShockStop stem is nothing like these components I have seen, handled, and ridden in the past. It is one of the rare stems that has a shock absorbing quality that actually seems to work and is a pleasure to ride."
"The ShockStop stem uses a combination of adjustable elastomers to offer a bit of flex that will take the edge off rough roads. The amount of 'travel' is dependent on the length, as well as the durometer of the elastomers."
"I’ve just finished a weekend of racing cyclocross - three races in three days, and I rode the bike with this stem all three days. My upper body is reasonably sore, but what I’m not experiencing is the nerve pain I’d expect from all the shock I delivered my neck from the great many bumps I hit. Call me a believer."
"Honestly, flat out 5/5, I think this is a GREAT bit of kit. Commuter, Sportives, Weekend Road Warrior everyone will likely benefit."
"Basically if you’ve ever thought that you had a little too much road buzz on your bike, or wanted a more comfortable ride, the RedShift ShockStop is for you. I don't think I’ve ever been quite so confident in giving out a TG 5-Star score before!"
"It certainly smoothed out the chatter that comes with using hard skinny tires on rough, damaged asphalt. On a long road ride or commute, that could go quite a ways towards reducing or even eliminating hand numbness."
"That the ShockStop is proving popular is hardly surprising. Comfort has been a big driver of development on road bikes in recent years, with bikes like the Specialized Roubaix intended to provide a smooth and more comfortable ride than a regular race bike. The interest in wider tyres has been motivated by a quest for more ride comfort, especially given the poor state of our roads."
"The Redshift ShockStop shock absorbing stem takes the old suspension stem idea to a simpler, modern design."
"It’s light. It’s simple. It fits on any bike pretty much. It’s easy to remove for rides where it’ll be superfluous. It doesn’t interfere with luggage carrying. The Flexstem may have been a bit of a dubious idea for mountain biking, but the ShockStop could be just the ticket for some cyclists out there."
Video Section Time-Stamps:
00:14 Compatibility
01:41 Choosing Your Starting Setup
03:00 Installing Inner Spring
05:36 Setting Initial Preload
06:55 Measuring Your Existing Saddle Position
08:11 Installing the Seatpost in Your Bike
09:56 Installing the Saddle
11:42 Positioning Your Saddle
14:03 Tightening the Saddle Clamp Bolts
16:27 Setting 20% Sag
18:22 Maintenance
"2500 mile update: Cannot imagine riding without it any more. Had to adjust the pre-installed elastomers once but thanks to the detailed video instruction that was simple even for a klutz like me. No more elbow issues at all and I had to ice my elbows for hours after 3-4 hour rides. Thank you Redshift Sports team."
- Werner, Austria
"I love the product! As an additional note this product has allowed me to stretch the cycling distances out even farther. In fact, we've purchased an electric assist bike for my wife so that she can catch up! Ha! You guys are the best."
- Matt S., USA
"I am coming up on a thousand miles. This stem is awesome. It does extremely well on the washboards and takes the sting out of bumps and embedded rocks. Great job."
- Craig, USA
"[ShockStop] is simply amazing. Today, I did a 30 mile trip on my usual roads and came home with NO PAIN for the first time in years. NO PAIN, you cannot believe the difference this has made to me. Best thing I have bought in years. Beautifully made and worth every cent."
- Brian C., Scotland
"I honestly love the stem"
- Michael S., USA
"Great work, guys! It worked very well and absorbed the bumps in places that would usually be rough and uncomfortable. After the Redshift stem the downhills feel very similar to how they do on my hardtail MTB."
- Kevin C., USA
"It's a game changer in my mind. I have just installed the two I bought - one on a flat bar electric bike and the other on my BMC Gran Fondo. I have to say the effect of the stem is amazing - so plush. I also think that the performance of the bike is enhanced because the energy of bumps is so effectively absorbed rather than clattering through the bike and your shoulders."
- Simon D., UK
"First impression: It’s fantastic. Like riding a new bike and a far better bike ;-). I drove a route with lots of roots and branches and the stem really killed the punches. :-) Compliment also to the design. As a designer, I love the clean cubic design and the simplicity. It looks great on the bike. I can not remember when I bought such a great part for my bike in the last few years. Well done! Also with 269 g it came in a little heavier then expected, but the weight penalty is fully compensated by its function."
- Gorden K., Germany
"[ShockStop] is] a superb product!! Would I recommend it? – Hell yes!! [It has] fundimentally changed my ride for the better. [The ShockStop] stem has to be the best improvement in road cycling since sliced bread. What a huge difference it has made to the comfort level of a ride (not overstated in your advertising). For a number of reason, NZ roads are not particularly smooth. It’s not uncommon to return home after 40+ Kms with sore wrists and forearms. So you can’t believe my delight on my very first outing of being immediately aware of the heavily suppressed jaring in the front end. I returned from that ride feeling that the advertised claims on the stem are fully justified and independantly confirmed."
- Noel M., New Zealand
"Bought two and love them. Just a FYI The stem works really well on a fat bike. I used the minimum bushing and it really counteracts the un dampened bouncy front tire when riding."
Gerard F., USA
"The ShockStop Works! I don't hate my road anymore (asphalt without a cap seal, so very gravelly). I purposely hit some bumps that bounced me out of my seat, but I didn't feel it in my hands! Arthritis in my wrists was really getting to be a problem, but this is really going to help. And the installation was simple."
- Bob F., USA
"After reading reviews I decided to order one of the stems. Realizing I didn't order the right length, I shot em an email and they corrected the order. Received in mail 3 days later. Had the land run 100 on Saturday and thought "trial by fire"...not a better place to give it it's maiden run, than there. Thoughts....heck yeah. Gonna buy one for road bike. Took the edge off all the vibrations that you feel thru the bars, and once you get the feel of how the bar moves, it's awesome."
- Danny B., USA
"Bottom line: Feels like you let 20 pounds of air out of your tires....but rolls like you didn't! Handling/steering: tight, no slop. Ride: Road buzz and bumps muted but of course still there."
- Edward N., USA
"I'm very pleased with it! It really smooths out the bumps...think of a very mild MTB suspension fork, and that's what it feels like. Would be very good on an hybrid bike, in fact, I think I'll look into purchasing another!!!"
- William M., USA
"Amazing product, works as claimed or even better!!! And installing the RedShift, easy peasy."
- Hector C.G., Spain
"Just finished an ultraman triathlon - the bike-leg [was] 11hrs [and] 285 km mostly in an aero position on generally poor roads with usually lots of road-buzz, but your stem kept me sane and totally relaxed throughout! and the stem-bracket held my front light as [I] was finishing after dark"
- Mordechai P., Israel
"[I] have to say that I am very impressed with the ride. It did everything I had hoped for by taking the edge off of big hits and smoothing out ripples and washboards. It sure appears the stem should be a hit with gravel riders."
Lindsey C., USA
"The first miles reveal a great job, exactly what I was expecting, and finally after many years waiting for a solution, so happy to get this one fulfilling all my attempts"
- Jean B., France