X 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

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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.

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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.

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.

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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.

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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.

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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.

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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.).

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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.

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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.

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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.