ShockStop Stem
from $149.99
ShockStop Seatpost
from $229.99
ShockStop System
from $349.99
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ShockStop Suspension Stem
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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.

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SHOCKSTOP SUSPENSION SYSTEM
SMOOTH THE ROAD
The Shockstop System is a revolutionary short-travel suspension system designed for all riders and all bikes. The ShockStop Seatpost and Stem suspend the rider, smoothing out rough terrain to let you ride faster, further, and more comfortably on the bike you already own.
GO FURTHER
The Shockstop System reduces the accumulation of fatigue that happens as your body absorbs bumps and vibration. Ride further than ever before and arrive feeling fresh.
RIDE FASTER
The Stem and Seatpost absorb momentum-killing bumps and vibrations. Energy that is normally wasted suspending your body is instead converted into for- ward motion.
TAKE CONTROL
The short-travel suspension floats over obstacles so you can maintain control through rough terrain. Customize the suspension feel to match your exact terrain and riding style.
"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
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
I'M A BIG FAN OF THIS SEATPOST. THE SUSPENSION ACTION IS JUST SO SMOOTH. - STU KERTON, ROAD.CC
"THE SHOCKSTOP STEM IS A TRULY EFFECTIVE RIDE-SMOOTHING SOLUTION WITH ALMOST NO PRACTICAL DOWNSIDES." - ROBIN WILMOTT, BIKERADAR
GOOD LOOKING, EFFECTIVE, AND EASILY SET UP. GET THE REDSHIFT SHOCKSTOP POST AND MATCH IT WITH A SHOCKSTOP STEM. GAME CHANGER INDEED. - GUITAR TED, RIDING GRAVEL
"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 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
"REGARDLESS OF BIKES, I WON’T RIDE GRAVEL WITHOUT THE SHOCKSTOP EVER AGAIN" - BEN EDWARDS, PELOTON MAGAZINE
AFTER TESTING... IT WON ME OVER. I LIKE THE REDSHIFT POST 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
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.

Benefits:

• 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

Stem Details:

• The ShockStop Stem in available in two angle options:
            - +/-6 degree in 80, 90, 100, 110, and 120mm lengths
            - +30 degree high-rise version in 100mm length only 
• Effective suspension travel:
            - Up to 20mm
• Includes 5 swappable elastomers to fine tune your riding style
• Check technical specs for compatibility


Seatpost Details:

• 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
• Optimized linkage geometry provides ultra-responsive suspension feel
• Check technical specifications for compatibility

What's in the Box:

• 1 x ShockStop Stem, 5 x swappable elastomers (2 pre-installed, 3 additional in box), and all required hardware
• 1 x ShockStop Seatpost, 2 x springs (1 pre-installed, 1 included in box for increased stiffness), and all required hardware
+TECHNICAL SPECIFICATIONS

ShockStop Suspension Stem:

Weight

254 g +/- 6 deg, 80mm

264 g  +/-6 deg, 90mm
274 g  +/-6 deg, 100mm
286 g  +/-6 deg, 110mm
298 g  +/-6 deg, 120mm
274 g  +30 deg, 100mm

Steerer Clamp Diameter (A)1-1/8 inch (28.6 mm)
Handlebar Clamp Diameter (B)31.8 mm
Effective TravelUp to 20mm on drop-bar bike
Up to 10mm on flat-bar bike
Material6061 T6 aluminum
Rider Weight Limit135 kg (300 lb)
Steerer Tube Clamp Stack Height40mm

ShockStop Suspension Seatpost:

Diameter27.2 mm (shims available for larger seat tube sizes)
Length350 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
Weight548 g - w/main spring
Rider Weight Limit110 kg (242 lb)
Material6061 T6 Aluminum Alloy
Saddle Rail Compatibility7mm round & 7x9mm oval
Di2 Battery CompatibilityYes (requires mount kit sold separately)
+FAQ

[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.

+INSTRUCTIONS

Download Instructions (PDF):
Instructions - ShockStop Suspension Stem
Instructions - ShockStop Suspension Seatpost
Instructions - Di2 Battery Holder for ShockStop Seatpost

Installing the 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