The patented ShockStop Suspension Stem smooths out road imperfections, reducing fatigue and strain. Whether you're on a local group ride, or exploring gravel back roads, the ShockStop Stem will make your ride smoother, faster, and more comfortable.
The minimal design of the ShockStop Stem blends seamlessly with the aesthetic of modern bikes, while reducing fatigue and strain. Along with the ShockStop Suspension Seatpost, this system works together to suspend the rider and smooth out rough terrain on the bike you already own, making your ride smoother, faster, and more comfortable. Great for bikepacking, gravel biking and commuter e-bikes.
Benefits of a Suspension Stem:
• Go further - reduce fatigue from bumps and vibrations • Ride faster - energy that is normally wasted suspending your body is converted into forward motion • Take control - customize your suspension feel to float over obstacles and maintain control over rough terrain
Suspension Stem Features
• The ShockStop Stem is available in two angle options and two steerer tube diameters: -+/-6 degree in 80, 90, 100, 110, and 120mm lengths (in both standard 1 1/8" steerer and the non-standard oversized 1 1/4" steerer which matches most Canyon and some Giant bikes) -+30 degree high-rise version in 80mm and 100mm lengths (only available for 1 1/8" steerer) • Effective suspension travel: - Up to 20mm • Includes 5 swappable elastomers to fine tune your riding style • Check technical specs for compatibility
What's in the Box:
• 1 x ShockStop Stem • 5 x swappable elastomers (2 pre-installed, 3 additional in box) • All required hardware
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
Steerer Clamp Diameter (A)
Standard 1-1/8 inch (28.6 mm) Oversized 1-1/4 inch (31.8mm)
Handlebar Clamp Diameter (B)
Up to 20mm
6061 T6 aluminum
Rider Weight Limit
135 kg (300 lb)
Steerer Tube Clamp Stack Height
Drop Bars and Flat Bars
note: flat bars with large back sweep might reduce effectiveness; see our FAQ or contact us.
ASTM F2043 Class 2 - For on and off-road riding and drops less than 15cm (6").
How do I choose the right length and angle for my bike?
We put together a set of instructions that can help you determine the length and angle of your existing stem and provide guidance on what to chose based on riding style - check it out here.
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.
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.
To read more Frequently Asked Questions about the ShockStop Stem, click here.
Installing the ShockStop Stem (see below for 80mm elastomer install details):
Elastomer Install and Removal for 80mm ShockStop Stem:
Elastomer Selection Chart:
(See instructions and video for elastomer installation details)
The above chart provides a good starting point when first setting up the stem. The chart below shows the full list of elastomer combinations, in order of increasing stiffness:
"I’M KICKING MYSELF FOR NOT INSTALLING THIS SOONER. MY FIRST RIDE ON THE SHOCKSTOP WAS AN EYE OPENER ... I HAVE NO PLANS TO TAKE IT OFF." - TYLER BENEDICT, BIKERUMOR
"I DIDN’T WANT TO LIKE THE SHOCKSTOP STEM AS MUCH AS I DID. I WAS DULY IMPRESSED BY THE SHOCKSTOP’S ABILITY TO SMOOTH OUT THE ROAD SURFACE WITHOUT BEING OBTRUSIVE." - JAMES HUANG, CYCLING TIPS
"THE SHOCKSTOP DOES WHAT IT CLAIMS TO DO AND DOES IT WELL WITHOUT DRAWING ATTENTION TO ITSELF, WHICH IS RARE THESE DAYS." - GUITAR TED, RIDING GRAVEL
"THE SHOCKSTOP STEM IS A TRULY EFFECTIVE RIDE-SMOOTHING SOLUTION WITH ALMOST NO PRACTICAL DOWNSIDES." - ROBIN WILMOTT, BIKERADAR
"SHOCKSTOP WORKS ... REALLY WELL. LIKE, ‘GAME CHANGER’ WELL. A GREAT OPTION FOR TRANSFORMING A HARSH RIDE INTO A SMOOTH, FATIGUE-REDUCED CRUISE, WHILE LOOKING DISCREET" - MIKE STEAD, ROAD.CC
"...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." - BEN EDWARDS, PELOTON MAGAZINE
"REGARDLESS OF BIKES, I WON’T RIDE GRAVEL WITHOUT THE SHOCKSTOP STEM EVER AGAIN" - BEN EDWARDS, PELOTON MAGAZINE
"HERE'S WHY I'D BUY ONE OF THESE STEMS: THEY DO WHAT THEY CLAIM TO, ARE DURABLE, AND MOST IMPORTANTLY, THEY LOOK NORMAL. I'M SOLD ON IT. THAT'S WHY I GOT ANOTHER ONE." - GUITAR TED, RIDING GRAVEL
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, Polar, or Wahoo bicycle computer (for options not in drop down, please email us at email@example.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 (frame side stem clamp)
The ShockStop is available in two different Steerer Tube Clamp options: Standard 1-1/8” and Non-standard 1-1/4” (fits most Canyon and some Giant bikes).
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.
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.
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.
If you chose the +30 deg ShockStop, you will need to choose either the 80mm or 100mm length option.
If you chose the +/-6 deg ShockStop, then you will need to 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.
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