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 with the make, model, year and size of your bike 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.
• 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 Lengths
55 & 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, available here)
ASTM F2043 Class 2 - For on and off-road riding and drops less than 15cm (6").
ShockStop PRO Race Suspension Seatpost:
Diameter
27.2 mm (shims available for larger seat tube sizes)
Length
280 mm (11 in) 350 mm (14 in)
Suspension Travel
20 mm (0.8 in)
Rearward Offset
7 mm (0.27 in)
Weight
280 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 Limit
110 kg (242 lb)
Material
6061 T6 Aluminum Alloy
Saddle Rail Compatibility
7mm round & 7x9mm oval
Di2 Battery Compatibility
Yes - standard battery holders will fit
Intended Use
ASTM 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.
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: - 55mm = 2.1 inches
- 70mm = 2.75 inches
- 80mm = 3.2 inches - 90 mm = 3.5 inches - 100 mm = 3.9 inches - 110 mm = 4.3 inches - 120 mm = 4.7 inches
1-1/4 inch steerer stems are not yet available in 55 and 70mm lengths but you can signup here to be notified.
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.
✕
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this thing doesnt look like much but trust me-it is! i seriously dreaded my bike as my arms felt like they were going to fall off. yup-lots of pain!
Now-with the help of this suspension stem-feels like a brand new bike!
I purchase a 2024 Crux over the summer, wanting to keep it stock as much a possible. After a couple of gravel rides it was a given that I needed to make the ride more forgiving. The first upgrade was to go to 45mm tires which was a big help and running a lower air pressure. The game changer was adding a Redshift Stem which provided better control and comfort during longer gravel rides. I love how my Crux rides now and is still light weight and fast.
Added an 80mm stem to my bike after a bike fitting as I wanted to give myself some more comfort on the terrible UK roads. The stealth look of the stem looks so nice and the instant difference it made to my overall ride enjoyment was amazing. It's subtle smoothening of the buzz of the road is immediately clear.
Would highly recommend it to anyone in the UK.
I am an 60 years old cyclist (former elite level) - After neck surgery, gravel cycling was not a possibility - that has changed. No post workout pain, and a surprisingly smooth ride on the gravel roads. As some cyclist has said - that it makes the safety/controlabilty worse - not my experience �
