ShockStop System - Seatpost
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90 day risk free trial
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Description
• Ride farther & more often - the ShockStop Endurance Seatpost reduces fatigue from bumps and vibrations with superior shock absorption.
• Ride faster & reduce fatigue - energy that is normally wasted suspending your body is converted into forward motion.
• Better performance & complete control - customize your suspension seatpost feel to float over obstacles and maintain traction and control.
Features
• 35mm of active suspension travelWhat's in the Box:
• 1 x ShockStop Endurance Suspension Seatpost• 2 x springs (1 pre-installed, 1 included in box for increased stiffness)
• All required hardware
What is a Suspension Seatpost?
A suspension seatpost is a specially designed bicycle seatpost featuring shock absorbing construction that helps smooth out bumps in the terrain and reduce the impact to the rider. They are best suited for gravel biking and bikepacking applications but are also used on road bikes to help riders stay in the saddle through rough course areas. Suspension seatposts are often used on hybrid, city and e-bikes as well, especially in urban environments with shifting concrete conditions.
The Shockstop suspension seatposts feature a proprietary parallelogram design, which allows for the suspension to remain active even when you're seated and pedaling. This means that you can benefit from the suspension's smoothing effect even when you're putting down power, unlike some suspension seatposts that become rigid when you're pedaling. For an ultralight, race-tuned version, choose the ShockStop PRO Race Suspension Seatpost.
The minimal design of the ShockStop Suspension Seatpost blends seamlessly with the aesthetic of modern gravel, road, and e-bikes. Along with the ShockStop Suspension Stem, this suspension system works together to reduce fatigue and strain, letting you ride farther, faster, and more comfortably.
Benefits of a Suspension Seatpost
Improved comfort: Suspension seatposts help to absorb shocks and vibrations from rough roads, reducing stress and fatigue on your body, especially your hands, arms, and back. This can lead to a more comfortable ride and reduced risk of injury.
Improved control: By absorbing shock and vibrations, a suspension seatpost can help to maintain traction and stability on rough roads, allowing you to ride with more confidence and control.
Reduced fatigue: By reducing the amount of stress and fatigue on your body, a suspension seatpost can help you to conserve energy and ride for longer without feeling as tired.
Better performance: By allowing you to maintain traction and control on rough roads, a suspension seatpost can help you to ride faster and more efficiently, especially on technical terrain.
Technical Specifications
Diameter and Lengths Available
| Diameter | 27.2mm, 30.4mm, 30.9mm, 31.6mm (shims available for additional non-standard seat tube sizes) |
| Length | 280 mm (11 in) 350 mm (14 in) 400mm (15.7in) 450mm (17.7in) |
| Suspension Travel | 35 mm (1.4 in) |
| Rearward Offset | 7 mm (0.27 in) |
| Rearward Offset (@ 25% travel) | 12 mm (0.47 in) |
| Spring Pre-load | User Adjustable |
| Weight | 280 mm – 497 g - w/main spring 350mm – 547 - 634g - w/main spring 400mm – 636 - 683g - w/main spring 450mm – 704 - 732g - w/main spring |
| Rider Weight Limit | 110kg (242lb) for 27.2mm and 30.4mm diameters 120kg (264lb) for 30.9mm and 31.6mm diameters |
| Material | 6061 T6 Aluminum Alloy |
| Saddle Rail Compatibility | 7mm round & 7x9mm oval |
| Di2 Battery Compatibility | Only compatible with the 27.2mm diameter x 350mm length (requires mount kit sold separately) |
| Intended Use | ASTM F2043 Class 2 - For on and off-road riding and drops less than 15cm (6"). |
Instructions
Download Instructions (PDF):
Instructions - ShockStop Endurance Suspension Seatpost
Instructions - Di2 Battery Holder for 350mm ShockStop Suspension 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
US Shipping Info
- Free Shipping with tracking – Applied to all orders under $74 USD.
- Economy Shipping with tracking – Orders over $74 USD qualify for free shipping.
- Economy Shipping with tracking – 1-3 business days after processing time.
- Orders ship via our third-party fulfillment service, that will select the most efficient carrier based on your location. Standard delivery typically takes 3-8 days, though in some cases, it may extend up to 15 days.
- Order processing time is 1-3 business days.
- If you order multiple items, they may be shipped from separate warehouses and may not arrive at the same time.
90 day risk free trial & returns
Different bikes sometimes have different seatpost diameters. The ShockStop Suspension Seatpost comes in 27.2mm, 30.4mm, 30.9mm, and 31.6mm diameters, so if your bike's seatpost is a different size, you'll need a shim to allow the 27.2mm or 31.6mm size to adapt 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.
What length should I choose? 280mm, 350mm, 400mm or 450mm?
350mm is our standard size, but we added the 280, 400, 450mm to allow for a wider range of fits. 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.
Smooth. Controlled. Effortless. The Future of Suspension
Years of research, cutting-edge technology, and rider-focused design—built to revolutionise your ride.
Adjustable Stiffness
Fine-tune your ride with customizable settings, optimising comfort and performance for any terrain.
Precision-Engineered Shock Absorption
Eliminates road buzz and dampens impact forces, reducing strain on hands, wrists, shoulders and back.
Optimised for All Riding Styles
Whether you're racing, exploring or commuting, we have an option that is designed to improve your riding experience.
Redshift trusted by
200,000+
As seen in
Spencer
Bought this post because of the AWFUL Chicago streets, and I am overjoyed at it's performance. I love that it is adjustable, feels extremely well-made, and enhances the look of my e-bike. Thank you for such a thoughtful product, my butt especially thanks you. Money well spent!
William S
This is a great addition to my gravel bike. It took a few adjustments to get the right elastomers but, it definitely smooths out the ride. Will be purchasing a set for my road bike.
Scott C
This seat post is a game changer!! Absolutely love it on my gravel bike .gonna get one for my hard tail Mtb now
TD
Love the stem!! It really takes out all the worse bumps from your ride, and on rough trails really did offer a smooth comfortable ride.
Lawrence C
I hesitated buying this stem wondering would it work, was it a waste of money but I’ve had three off road rides with my new stem and I love it. I usually get pins and needles in my hands after riding for a while but that’s gone now. Added to the comfort is the improved handling on bumpy tracks and roads. I can ride a corrugated road now without feeling like I will get shaken off the bike. Very happy.
Jim G
I love my Redshift post! I recently had a lumbar contusion and the post has smoothed and cushioned the roads and trails. I’m able to stay on the bike while healing.
Ian S
After much thought I bought a red shift suspension stem and initial thoughts are that it's good, think they will become standard across all my gravel bikes.
Stephen H
I just finished my first ride with the Resdhift Shockstop Suspension Stem and I noticed the difference immediately. Having ridden for many years with rigid front ends (I’m 64) I now wish I had discovered this earlier in my life. The chatter that it removes from my wrists, arms and shoulders is easily noticed. This experience has been so good that now I’m considering the seatpost Redshift offers as well. The interesting thing for me is that I’ve promoted and sold these products for years based upon input from others. I just didn’t think I needed one myself. Get yourself one! You’ll never go back.
Mark G
The shock absorber was easy to install and works as described cuts down on the impact. I recommend it if you're going to do gravel, writing and bumpy bumpy roads
Karlos R
Wow, once I got the fit dialed on this seat post I thoroughly understood why everyone was upgrading their set ups with these products. Riding a long distances is what I do for fun and for a living and this seatpost made all the difference in the world. Pay attention to the recommended Sag settings as its key to finding comfort and keeping a proper pedaling extension. 10 out of 10 would recommend.
Perfect For
Gravel Riding
Absorbs rough terrain and vibrations, improving comfort and control on long gravel rides.
Road Cycling
Reduces road buzz and impact from potholes, allowing for a smoother, more efficient ride
Bikepacking & Touring
Minimises fatigue on long-haul adventures, making multi-day rides more comfortable
Commuting
Handles city streets, curbs, and uneven surfaces with ease for a more enjoyable daily ride.
- Reviews
- Questions
great bit of kit
the redshift seat post makes riding my electric bike so much more comphy. great bit of engineering.
United StatesGravel
The shock absorber was easy to install and works as described cuts down on the impact. I recommend it if you're going to do gravel, writing and bumpy bumpy roads
United KingdomMade the difference.
Nearly 60 and coming from MTB to gravel rides that are all about big day on tarmac to single track. The pros, extremely well made and just provide a world of comfort. On off road climbs it means I can stay in the saddle and keep traction. Suddenly hits don’t get you knocked off balance. Cons, fiddly to set up there is a lot of movement so takes some fettling to get damping and saddle / reach right. Took a couple of rides to nail. Wish I had bought the 90mm shock stop stem now instead of the 100 mm straight swap. Think will have to look at the bars to get some rise and sweep Top gear if that’s what your looking for ( also fitted 14ltr seat post saddle bag fine)
United StatesBest decision ever
This is some of the best money I have ever spent. Put both the seat post and stem shock on a Specialized Divergent gravel bike. It turned a good bike into a great one. First ride out was 55 miles of dirt and gravel. I am 65 so discomfort is a part of everyday life. This has reduced the numbness in my wrists and hands by at least 70%. Also reduced the discomfort in my neck and lower back a similar amount. I only wish I would have done this sooner. If you are looking for a way to make your riding more enjoyable, this is it. My wife even let me put the shock post on her gravel bike. She is a hard core/tuff it out rider who puts in between 8-10,000 miles per year. It is a fantastic product we feel will extend our years on a bike.
AustraliaBest suspension seat post on the market
Stylish and effective. Takes the edge of those bumps without going full dually.
CanadaTakes the bumps out of my forest trail-commute
I commute 15km on forested trails, mix of some gravel but mostly uneven dirt trails with rocks and roots, and after about 2 weeks or 150km of this I am really happy with my new seat post. The difference is immediately noticeable, but still subtle. So it didn’t change my ride much, but just made it more comfortable. It was also easy to install and the service and advice about the model were both great.
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