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.
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.
• Go further - 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
• The ShockStop Stem is available in two angle options: -+/-6 degree in 80, 90, 100, 110, and 120mm lengths -+30 degree high-rise version in 100mm length only • The ShockStop PRO Stem is available in +/-6 deg angle and: -80, 90, 100, 110, and 120mm lengths • Effective suspension travel: -Up to 20mm • Includes 5 swappable elastomers to fine tune your riding style • Check technical specs for compatibility
• 35mm of active suspension travel
• Infinitely adjustable stiffness via pre-load adjustment and swappable springs
• Adjusting stiffness / pre-load does not shorten travel
• Swappable springs included to accommodate varied rider weight and preference
[Stem] 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.
[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] Can I put the ShockStop Stem on my mountain bike?
Yes and No. The suspension travel on the ShockStop (1-2cm) is optimized for the types of bumps you typically encounter on roads and light trails. So, the ShockStop Stem is not going to provide the same suspension feel as a typical mountain bike front fork suspension, which will have closer to 10-15cm of travel. However, if you use your bike primarily on the lighter trails (i.e. not aggressive downhill) and you’re looking to take the edge off of an otherwise stiff frame (e.g. a bike with a rigid front fork), then the ShockStop could be exactly what you’re looking for. The ShockStop Stem is not designed to be used on a mountain bike riding on technical downhill singletrack and if used in these conditions could become damaged and lead to serious injury.
To read more Frequently Asked Questions about the ShockStop Stem, click here.
[Seatpost] What is the minimum and maximum insertion depth and clearance for the ShockStop Seatpost?
[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. The seatpost comes with a standard spring and an additional spring that can be added inside the standard spring to increase the stiffness. The preload adjustment knob at the bottom of the seatpost allows you to adjust the spring preload - the amount of force required to cause the saddle to start moving.
To read more Frequently Asked Questions about the ShockStop Seatpost, click here.
Installing the ShockStop Stem (see below for 80mm elastomer instructions):
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:
Installing the ShockStop 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 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
"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
"REGARDLESS OF BIKES, I WON’T RIDE GRAVEL WITHOUT THE SHOCKSTOP STEM EVER AGAIN" - BEN EDWARDS, PELOTON MAGAZINE
"THE SHOCK STOP SEATPOST IS A SLEEK LOOKING, COMPACT DESIGN INITIAL IMPRESSIONS ARE QUITE FAVORABLE ACROSS THE THREE TESTERS" - GUITAR TED, RIDING GRAVEL
EXTRAORDINARY COMFORT. I WAS AWARE OF SURFACE UNDULATIONS, BUT THE SHOCKSTOP IS SO REACTIVE THAT NO IMPACTS OR VIBRATIONS MADE IT TO THE SADDLE. - ROBIN WILMOTT, BIKERADAR
"THE POST IS QUITE ACTIVE WITHOUT FEELING BOUNCY. IT IS A GAME-CHANGER ON AND OFF-ROAD, DOWNHILL AND UP IN THAT YOU CAN SIT IN TO APPLY THE POWER OVER BUMPY TRACK." - CLIFF LEE, CX MAGAZINE
I'M A BIG FAN OF THIS SEATPOST. THE SUSPENSION ACTION IS JUST SO SMOOTH. - STU KERTON, ROAD.CC
AFTER TESTING... IT WON ME OVER. I LIKE THE REDSHIFT ENOUGH TO KEEP IT ON - RUSS, PATH LESS PEDALED
THE SHOCKSTOP SEATPOST IS IMPRESSIVE. IT VIRTUALLY ERASES SMALL AND MID-SIZED BUMPS AND DOESN’T BOB EXCESSIVELY ON SMOOTHER SURFACES. - MATT GERSIB, RIDING GRAVEL
DEFINITELY SOMETHING I WOULD ADD TO MY STABLE - COLIN LEVITCH, CYCLIST
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 email@example.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.
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 (options not in drop down are available here).
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 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, 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 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.
ShockStop Computer Mount
ShockStop Utility Mount
Di2 Battery Holder
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