Free Shipping & Free Returns for 🇺🇸 🇨🇦 🇬🇧 🇪🇺* - Sign up here for 10% OFF Your 1st Order!

Free Shipping & Free Returns for 🇺🇸 🇨🇦 🇬🇧 🇪🇺* - Sign up here for 10% OFF Your 1st Order!

ShockStop Suspension System

$419.98 - $579.96 $384.70 - $533.76

ShockStop Suspension System

$419.98 - $579.96 $384.70 - $533.76

The patented ShockStop Suspension System smooths out road imperfections, reducing fatigue and strain. Whether you're on a local group ride, or exploring gravel back roads, the ShockStop Stem and Seatpost will make your ride smoother, faster, and more comfortable. *If you have a Canyon, Giant or Scott bike, it may have an oversized steerer tube. If you're unsure if your steerer tube is standard or oversized, please email us at support@redshiftsports.com and we're happy to help you.

DESCRIPTION

The minimal design of the ShockStop Suspension Stem and Suspension Seatpost blend seamlessly with the aesthetic of modern bikes, while reducing fatigue and strain. The stem and seatpost work together to suspend the rider and smooth out rough terrain on the bike you already own, making your ride smoother, faster, and more comfortable.

If you have a Canyon, Giant, or Scott, it may have an oversized steerer tube. If you're unsure if your steerer tube is standard or oversized, please email us at support@redshiftsports.com and we can help you choose the right version.

Benefits:

• Go farther - reducing fatigue that happens as your body absorbs bumps and vibrations
• Ride faster - feeling refreshed from the energy that is normally wasted suspending your body as it is converted into forward motion

• Take control - customizing your suspension feel to float over obstacles so you can maintain control

• Effective suspension travel:
            - Up to 20mm
• Includes 5 swappable elastomers to fine tune your riding style
• Check technical specs for compatibility

Stem Details:


Lengths

Angles

Diameters

55, 70mm (Drop bars only)

+6 degree

1 1/8" steerer tube

80, 90, 100, 110, and 120mm

+/-6 degree

1 1/8" steerer tube - appropriate for most riders. Please contact us if you have a non-standard/oversized steerer tube and need 1-¼” size.

80mm and 100mm

+30 degree

1 1/8" steerer tube


            

Should I get the PRO Stem?:

• The ShockStop PRO Stem has a sleek, polished 'blacked out' appearance, and offers ~15% weight savings (depending on length) over the standard ShockStop Stem. It achieves these weight savings thanks to the use of Titanium hardware, and weight reducing CNC machining.
• The ShockStop PRO Stem functions the same as the standard ShockStop Stem, and is the ideal choice for a more performance focused and weight conscious rider.

 

Seatpost Details:

• Optimized linkage geometry provides ultra-responsive suspension feel
• The ShockStop Seatpost is available in Endurance, PRO Endurance, and PRO Race versions. Full product comparison chart here


What's in the Box:

• 1 x ShockStop Stem
• OR ShockStop PRO Stem, 5 x swappable elastomers (2 pre-installed, 3 additional in box), and all required hardware
• 1 x ShockStop Endurance Seatpost, 2 x springs (1 pre-installed, 1 included in box for increased stiffness), and all required hardware
• OR 1 x ShockStop PRO Endurance Seatpost, (2 pre-installed elastomers and 2 pre-installed springs, 1 extra elastomer in the box), all required hardware
• OR 1 x ShockStop PRO Race Seatpost, 2 x springs pre-installed with one elastomer pre-installed and one elastomer in the box.
+TECHNICAL SPECIFICATIONS

ShockStop Suspension Stem:

 80-120mm Lengths55 & 70mm Lengths (NEW)
Weight

256 g +/- 6 deg, 80mm
266 g  +/-6 deg, 90mm
278 g  +/-6 deg, 100mm
290 g  +/-6 deg, 110mm
302 g  +/-6 deg, 120mm
253 g  +30 deg, 80mm
278 g  +30 deg, 100mm

For oversized steerer, add 2-5 g

185 g +6 deg, 55mm

212 g +6 deg, 70mm

Steerer Clamp Diameter (A)

Standard 1-1/8 inch (28.6 mm)

Oversized 1-1/4 inch (31.8mm, for +/6 deg options only)

Standard 1-1/8 inch (28.6 mm)
Handlebar Clamp Diameter (B)31.8 mm31.8 mm
Effective TravelUp to 20mmUp to 20mm
Material6061 T6 aluminum6061 T6 aluminum
Rider Weight Limit135 kg (300 lb)135 kg (300 lb)
Steerer Tube Clamp Stack Height40mm44mm
Compatibility

Drop Bars and Flat Bars

note: flat bars with large back sweep might reduce effectiveness; see our FAQ or contact us.

Drop bars only
Intended UseASTM F2043 Class 2 - For on and off-road riding and drops less than 15cm (6").ASTM F2043 Class 2 - For on and off-road riding and drops less than 15cm (6").


 

ShockStop Endurance Suspension Seatpost:

Diameter27.2 mm (shims available for larger seat tube sizes)
Length280 mm (11 in)
350 mm (14 in)
Suspension Travel35 mm (1.4 in)
Rearward Offset7 mm (0.25 in)
Rearward Offset (@ 25% travel)12 mm (0.4 in)
Spring Pre-loadUser Adjustable
Weight280 mm is 498 g - w/main spring
350 mm is 548 g - w/main spring
Rider Weight Limit110 kg (242 lb)
Material6061 T6 Aluminum Alloy
Saddle Rail Compatibility7 mm round & 7x9 mm oval
Di2 Battery CompatibilityOnly compatible with the 350mm length
(requires mount kit sold separately)
Intended UseASTM F2043 Class 2 - For on and off-road riding and drops less than 15cm (6").

 

 

ShockStop PRO Endurance Suspension Seatpost:

Diameter27.2mm (shims available for additional non-standard seat tube sizes)
Length280 mm (11 in)
350 mm (14 in)
Suspension Travel35 mm (1.4 in)
Rearward Offset7 mm (0.27 in)
Rearward Offset (@ 25% travel)12 mm (0.47 in)
Spring Pre-loadUser Adjustable
Weight280 mm – 445 g 
350mm – 502 g
Rider Weight Limit110kg (242lb) for 27.2mm diameters
Material6061 T6 Aluminum Alloy
Saddle Rail Compatibility7mm round & 7x9mm oval
Di2 Battery CompatibilityOnly compatible with the 27.2mm diameter x 350mm length
(requires mount kit sold separately)
Intended UseASTM F2043 Class 2 - For on and off-road riding and drops less than 15cm (6").

 

 

ShockStop PRO Race Suspension Seatpost:

Diameter27.2 mm (shims available for larger seat tube sizes)
Length280 mm (11 in)
350 mm (14 in)
Suspension Travel20 mm (0.8 in)
Rearward Offset7 mm (0.27 in)
Weight280 mm – 380 g (with 2 elastomers)
280 mm - 410 g (with 1 elastomers and double spring)
350 mm – 415 g (with 2 elastomers)
350 mm - 445 g (with 1 elastomer and double spring)
Rider Weight Limit110 kg (242 lb)
Material6061 T6 Aluminum Alloy
Saddle Rail Compatibility7mm round & 7x9mm oval
Di2 Battery CompatibilityYes - standard battery holders will fit
Intended UseASTM F2043 Class 2 - For on and off-road riding and drops less than 15cm (6 inches).
+FAQ

[Stem] How is the ShockStop Stem different from other suspension stems?

There are a lot of ways the ShockStop is different - so many in fact, we wrote a whole blog post about it. Check it out here.
 

[Stem] How do I measure my steerer tube diameter?

The easiest way to determine your steerer tube size is to 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. Alternatively, most of the time a manufacturer will list this under their specifications in the Frame/Fork section. Make sure you are looking at the correct model year as these sizes can change year to year.
The 1-1/8" ShockStop Stem is the standard size used by most modern bikes. The 1-1/4” version can now be used on popular brands such as Giant and Canyon bikes (please contact us if you need a 1-¼" size). 
 

To read more Frequently Asked Questions about the ShockStop Stem, click here.


 

[Seatpost] What length should I choose?


350mm is our standard size, but we added the 280, 400, 450mm to allow for a wider range of fits (400 & 450 only available for the ShockStop Endurance Seatpost). Measure your current seatpost from the clamp collar to the saddle rail:

  • If that distance is less than 205mm, you can use the 280mm suspension seatpost.
  • If it is between 205mm and 250/275mm (depending on diameter) order the 350mm size.
  • If it is between 250 (larger diameters than 27.2) and 300mm order the 400mm size.
  • If it is between 300 (larger diameters than 27.2) and 350mm order the 450mm size.

 

 

[Seatpost] What kind of saddle bags can I use with the ShockStop Suspension Seatpost?

Most standard strap-based saddle bags will fit the ShockStop Seatpost without issue. If your saddle bag uses rigid clips, clamps, or some other inflexible attachment method, it's possible that your bag may not be compatible.
Any bag that just attaches to the saddle or just attaches to the post is fine. But when you attach to both the post and the saddle you need to account for the relative motion of the saddle to the post. This means that if you cinch down the bag when off the bike it might have some movement when you get on the saddle and compress the post a bit - this might not be a problem but it might be something that is an issue.
It all really depends on weight and how stable the bag is and if it is attached to both the post and the saddle - it can be fine but with a lot of weight it will mean it can move around when the post is compressed. It will likely come down to testing it out with your specific bag to see how it works. And if you have a bag that is able to be secured to just the post or to the post and a rear rack then you will be all set.
 

[Seatpost] Is the stiffness of the ShockStop Seatpost adjustable?

Absolutely - We designed the ShockStop Seatpost so that you can adjust it to perfectly match your weight and riding style. Depending on the version you've chosen, the seatpost comes with: 

Endurance - a standard spring and an additional spring that can be added inside the standard spring to increase the stiffness.

PRO Endurance - inner & outer coil, 2 pre-installed elastomer + extra elastomer in the box that can be swapped to increase the stiffness.

PRO Race - inner & outer coil, pre-installed elastomer + extra elastomer in the box that can be swapped to increase the stiffness.

The preload on the Endurance and PRO Endurance versions have an adjustment knob at the bottom of the seatpost that allows you to adjust the spring preload - the amount of force required to cause the saddle to start moving. The PRO Race version has a set preload but the stiffness can be adjusted by changing the elastomers inside. 
 

To read more Frequently Asked Questions about the ShockStop Seatpost, click here.

+INSTRUCTIONS

Stem Instructions & Videos

55mm & 70mm Lengths [NEW]:

Download (PDF) Instructions:

Instructions - ShockStop Suspension Stem - 55mm & 70mm lengths

Elastomer Selection Chart:

Elastomer Selection Chart for 55mm & 70mm ShockStop Stems


Installation Video (55 & 70mm Stems):



80mm Length:

Download (PDF) Instructions:

Instructions - ShockStop Suspension Stem - 80mm length

Elastomer Selection Chart:

Elastomer Selection Chart for 80mm ShockStop Stem


Elastomer Install and Removal Video (80mm Stem):



90-120mm Lengths:

Download (PDF) Instructions:

Instructions - ShockStop Suspension Stem - 90-120mm lengths

Elastomer Selection Chart:

Elastomer Selection Chart for 90-120mm ShockStop Stems


Installation Video (90-120mm stems):

Seatpost Instructions & Videos

Download Instructions (PDF):
Instructions - ShockStop Endurance Suspension Seatpost

Instructions - ShockStop PRO Endurance Suspension Seatpost

Instructions - ShockStop PRO Race Suspension Seatpost
Instructions - Di2 Battery Holder for 350mm ShockStop Seatpost

 

Installing the ShockStop Endurance Suspension Seatpost:

 





 

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 Shockstop Suspension 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  

 

X

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. 
- Note that some mountain bikes have “over-sized” 35 mm handlebars which are not compatible with the 31.8mm clamp and would need to be replaced with a 31.8 mm handlebar in order to be compatible with the ShockStop Stem.


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.

Different bikes sometimes have different seatpost diameters. The ShockStop 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.

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.
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.
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 seatmast, the seatpost is also not compatible.

350mm is our standard size, but we added the 280, 400, 450mm to allow for a wider range of fits (400 & 450 only available for the ShockStop Endurance Seatpost). Measure your current seatpost from the clamp collar to the saddle rail:

  • If that distance is less than 205mm, you can use the 280mm suspension seatpost.

  • If it is between 205mm and 250/275mm (depending on diameter) order the 350mm size.

  • If it is between 250 (larger diameters than 27.2) and 300mm order the 400mm size.

  • If it is between 300 (larger diameters than 27.2) and 350mm order the 450mm size.

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/Magellan, or Wahoo bicycle computer (for options not in drop down, please email us at support@redshiftsports.com).

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.). 

 

Steerer Tube Diameter  
 

The ShockStop is available in two different Steer Clamp options: 1-1/8” and the new 1-1/4”

The 1-1/8in ShockStop stem fits standard 1-1/8in (28.6mm) steerer tubes which is the size used by most modern bikes. With the introduction of our new 1-1/4” version the Shockstop can now be used on popular brands such as Giant and Canyon bikes (please check your exact model specs to be certain).

The easiest way to determine your steerer tube size is to 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.

If you don’t have easy access to either, a shop or a set of calipers you can check your manufacturers website. Most of the time a manufacturer will list this under their specifications in the Frame/Fork section. Make sure you are looking at the correct model year as these sizes can change year to year.

Alternate method: Use a fabric or paper measuring tape (or print one at https://printable-ruler.net/ ) and measure the circumference of the steerer tube. You will need to remove the compression cap and loosen the two pinch bolts to get access to your steerer tube so be sure you are comfortable in doing so and then reassembling properly. 

  • A 1 1/4”(31.8 mm) steerer clamp will be 99.9 mm in circumference at the center.
  • A 1 1/8” (28.6mm) steerer clamp will be 89.9 mm in circumference at the center.
  • A 1” (25.4 mm) steerer clamp will be 79.8 mm in circumference at the center.

Stem Angle 

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

In general, you'll find the +30 deg stem provides a more upright, comfort-oriented fit, whereas the +6 and +/-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, you can choose either an 80mm or 100mm length option.  
 

If you chose the +6 degree , you can choose either a 55mm or 70mm length:

- 55mm = 2.2 inches 
- 70mm = 2.75 inches 


If you chose the +/-6 deg ShockStop, then you can choose one of 5 different length options: 
- 80mm = 3.2 inches 
- 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 90 mm. This is one of the most common lengths and tends to be a good fit for most people.

RELATED PRODUCTS
Customer Reviews
4.9 Based on 1,470 Reviews
5 ★
93% 
1372
4 ★
7% 
98
3 ★
0% 
0
2 ★
0% 
0
1 ★
0% 
0
Customer Photos
Write a Review Ask a Question

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Filter Reviews:
VG
10/03/2024
Victor G.
Belgium Belgium

Perfect

Smooth driving with less impact on my shoulders

VG
10/03/2024
Victor G.
Belgium Belgium

Better than expected

It smooths out a lot of bumbs which results in les impact on the body and a faster driving experience. Super easy to install and to adjust to your body

NP
10/01/2024
neil p.
United Kingdom United Kingdom

70mm Shockstop Suspension Stem

I didn’t think it would make that much difference, but I couldn’t have been more wrong! Tried it on the stock setting for three rides and was more than happy with the cushioning, but decided to try it on the softer setting as most of my rides on my gravel bike are more like off piste mountain bike routes. It feels amazing - I love it!

KP
10/01/2024
Kevin P.
United Kingdom United Kingdom

Stem

Very good so far

DB
10/01/2024
Daniele B.
Netherlands Netherlands

The best upgrade for my gravel

It adds comfort to every ride without diminishing the overall performance. I use my gravel bike on mtb trails and so my wrists and shoulders were very thankful.

Redshift Sports ShockStop System - Stem Review
KB
09/30/2024
kim b.
United States United States

Great for cyclocross too

Have stem on gravel bike. Like it lots Had shoulder issues this year. Put stem on Focus cyclocross bike. Used in recent race. Easier on shoulder and seemed to keep front wheel connected on bumpy areas Showed stem to others. One guy bought for his gravel bike. I think more should try for cyclocross