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Availability:
20 left in stock
Arrives
Sep 14 – Sep 16
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Size: 27.2mm Dia x 280mm Length
Features
- RIDE FARTHER, FASTER, AND MORE COMFORTABLY The ShockStop bicycle endurance suspension seatpost is the perfect upgrade to your road, gravel, bikepacking, all-road, hybrid and e-bike with standard sizes to fit any brand of bike. More comfort at the saddle means youll be able to ride longer, go faster, and stay in control even on the roughest terrain. Choose from 4 lengths (280, 350, 400, and 450mm) and 4 diameters (27.2, 30.4, 30.9, and 31.6mm) in order to get the best fit for your bike.
- DAMPEN BUMPS AND VIBRATION BY UP TO 60%! Say goodbye to your sore butt and pain from riding and say hello to increased control, more confidence, and a super smooth ride. The patent-pending ShockStop Suspension Seatpost for bicycles reduces the effects of bumps, shocks, and road buzz by up to 60%!
- REDUCE FATIGUE AND INCREASE EFFICIENCY Stop wasting energy suspending your body to absorb impacts and vibrations. This shock absorber bike seatpost allows you to stay in the saddle and keep pedaling even over the most extreme terrain. Consistent power output and reduced fatigue enables you to go further and faster on the bike you already own.
- 35mm OF TUNABLE SUSPENSION TRAVEL The ShockStop bike suspension seatpost has 35mm of tunable, ultra-responsive suspension travel. The optimized four-bar linkage ensures that your saddle angle remains constant through the full range of travel. Adjust the preload and swap in and out springs to find your perfect setup and match the seatpost to your preferred riding style.
- EASY TO INSTALL AND MAINTENANCE FREE The multiple diameter and length options allow this shock-absorbing seatpost to fit all modern bikes and installs in minutes (shims are available to fit additional sizes).
Description
Tunable, responsive suspension travel for the ultimate bump-eating comfort. Reduces bumps and vibrations by up to 60%, helping minimize rider fatigue and improve overall comfort on every ride. Easily adjust the preload dial or change the springs to fine-tune the ride based on your body weight and riding preference Machined from 6061 T6 aluminum, it’s both lightweight and built to last. Easily & accurately set saddle position with 2 bolt seatpost saddle clamp. Endurance Seatpost PRO Endurance Seatpost City Seatpost Standard Stem PRO Stem Is the stiffness of the ShockStop Seatpost adjustable? The ShockStop Suspension Seatpost adjusts to your weight and style. It includes standard and extra internal springs for increased stiffness, plus a bottom preload knob to fine-tune the exact force needed to initiate saddle movement. What kind of saddle bags can I use with the ShockStop Suspension Seatpost? Standard strap bags fit easily, but rigid clamps may not. Bags on both saddle and post move as the post compresses under weight, so test your specific setup. Bags attaching to just the post or a rear rack work best with zero issues.
Color: Black
Item Weight: 0.7 kg
Material: Aluminum
Brand: REDSHIFT
Product Dimensions: 1.07"W x 13.78"H
Brand Name: REDSHIFT
Manufacturer: REDSHIFT
UPC: 850027370279
Global Trade Identification Number: 79
Included Components: Seatpost
Item Type Name: Seatpost
Model Number: RS-50-02-MB
Manufacturer Part Number: RS-50-02-MB
Warranty Description: 2 year manufacturer
Item Weight: 0.7 kg
Item Dimensions W x H: 1.07"W x 13.78"H
Item Diameter: 27.2 millimeters
Color: Black
Material Type: Aluminum
Bike Type: Hybrid Bike
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Sep 14 – Sep 16
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Similar Products
Top Amazon Reviews
Size: 27.2mm Dia x 350mm Length
This is a review of the Redshift ShockStop Stem and Seatpost. I purchased and installed both products, and they were complete game changers for my ride. I bought the 27.2 x 350 mm Seatpost, and the 90 mm 6 degree stem. I installed them on my Trek Domane AL5 2025. The Seatpost was a bit longer than stock, but my fit is a fairly high seat, so there were no issues. It easily met the minimum insertion requirements. The stem was +/- 6 degree, my stock stem was +/- 7 degree so it was reasonably close. I installed it as +6 and it didn't change my ride geometry enough to be an issue. For the seatpost, a quick read of the instructions made it easy to understand how to setup the preload. I set the preload slightly soft for my weight, greased the stem, and installed it on my bike. I was careful to follow torque recommendations for tightening the stem in place. Installing the seat on the seatpost was a little bit of a challenge. the Redshift seatpost is a 2 screw mount, they are accessible, but not easily. It is a balance act to tighten both to set the correct seat angle, but with some loosening of one screw and tightening of the other, it can be accomplished. I would say that installing the seatpost took about 45 minutes to get it just how I wanted. I expect changing the preload to take me about 5 minutes, and there are clear markings in cm to aid me in installing the seat to the exact height that it was previously installed at. For the stem, a quick read of the instructions identified that I was at the very bottom of my weight group for what elastomers to install. The next combination down was a significant change. The instructions stated that I could go onto Redshift's website and view a complete list of combinations. This was slightly challenging. On the page for the stem there is no information about elastomer selection. On the support page I did find links to a video and pdf for elastomer selection. I elected to view the pdf, and printed it. Sure enough there were 2 combinations between the 2 options listed on the instructions. I selected the stiffer of the two (just below the one recommended for my wight). I mounted the stem on my bike, and mounted my handlebars. Again make note of the torque recommendations, Redshift has had them engraved on the stem, so they are hard to miss. This also took about 45 minutes. To change the elastomers, I will have to unmount my handlebars and remove a retaining plate from my stem. I do not look forward to my expected 25 minutes or so just to change elastomers. I took my bike out for a nice long ride, 20 miles, 15 MPH, and asphalt. The only downside to this trail, and the reason I bought the Redshift parts, is that there are several points where tree roots have pushed up the asphalt and created some very jarring speedbumps. Without the Redshift products, these were uncomfortable at best, and sometimes made me feel like I was on the edge of controlling my handle bars. This ride, with both installed, the seat was easy to manage, and did not hit hard. With the stem installed, I could still feel every twig and root, but it was very much dampened. You do not feel disconnected from the road, but you are very much more in control. By the end of the ride, I felt less fatigue in my arms and less soreness from the seat. While researching elastomers, I read that there is a break-in period, I would say that by the end of my 20 mile ride, the stem did offer better bump dampening than it did at the start, but I do feel that the elastomer selection I made from the support pdf was spot on. Pros: They do exactly as they advertise Clear instructions (with the exception of elastomer selection) Relatively simple installation More control Less shock Well manufactured Clean looking Cons: Neither of these items are what I would call cheap 2 bolt connection for the seat is fiddly, but manageable Elastomers, the best list is online only and not as easily found as I would have thought The listing for the stem is clear that it is a 6 degree stem, but it is hard to identify if it will install as +, - or both They only come in black, not an issue for me as I was replacing black parts with black parts, but some might like other colors Summary: If you have the money, and want a smoother ride, these are quality parts to compliment and soften your ride.
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Reviewed in the United States on June 30, 2025 by jfb9301
Just finished installing and test driving the REDSHIFT ShockStop Endurance Suspension Seatpost for my e-bike, and the difference is night and day. I inserted the inner spring because I weigh about 236 pounds and the preload is set to three and it's perfect. I'm also using the Cloud Nine saddle and the ride is just unbelievably smooth while pedaling. The price is a little steep, but I'm pretty sure this is the best money can buy. Highly recommend.
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Reviewed in the United States on June 29, 2026 by Emerson
I love it more than expected. It is like having a full suspension bike. Make sure to remove and measure your old seat post to order the right size. I bought it for a medium ebike, but the post I ordered was a little too short. However, I kept it because the size was right for my large Mt Bike. Then I bought a second one for my ebike. It comes with 2 springs and it has a load adjustment to provide the perfect feel. The second spring fits inside the first spring to provide less bounce or for heavier riders. The second spring requires installation, if you want to use it. I am 200 lbs and I tried it with one and two springs. I liked it better with one spring. The bottom of the post has the load adjustment. You turn the bottom cap one way or the other to adjust the load. It goes from 1 to 5 mm. I kept it in the middle and am very happy with how it rides. It was 20% off when I bought it. It was worth waiting for a sale because they are expensive for a seat post. Especially when you get more than one.
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Reviewed in the United States on May 12, 2025 by TechUser
Size: 27.2mm Dia x 350mm Length
I will add myself to the list of those "I can't believe I waited so long" to install one of these. As I have gotten older, I have noticed all the bumps in the road more and more. Recently, after doing my research, I installed a Kinekt stem and afterward, realized what I really wanted for a more comfortable ride was a suspension type seatpost. Going back to the books, I ultimately decided on this Redshift Seatpost. If I have a complaint about the Kinekt stem, it is that I wish it had an even stiffer spring than the hardest one they ship with it. I worried I would have the same issue with the Kinekt seatpost. Add to that that the Redshift appears to have more adjustability, the option of adding the second spring and an overall sleeker design, and it seemed right. It was - for me. I played with the settings a bit (I am 6'1" and about 240), and immediately added the second spring. The preload - while slightly more "fiddly" than the Kinekt (you have to remove the seatpost to adjust it), once "dialed in" is great. I actually have mine a little softer than what a hard rider might want, but it seems to be just the right cushion for all the bumps I encounter - I ride the Pinellas County trail mostly, as well as the streets necessary to get me there. My bike is a Giant Anyroad aluminum road bike with a composite fork - so already a more comfortable ride profile, but this adds enough so that I again am anxious to get out and ride. Pay attention to your seatpost diameter. My Anyroad has a larger diameter, so I also had to buy a shim (Redshift says it must be at least 4" long). This is the most expensive add-on I have on my bike. Is it worth it? In a word, ABSOLUTELY
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Reviewed in the United States on January 24, 2021 by Andy
Size: 27.2mm Dia x 350mm Length
As described, game changer for bike rides. Once adjusted, the ride is more enjoyable and you get more out of it too.
Reviewed in the United States on August 18, 2026 by Saul
Size: 27.2mm Dia x 350mm Length
This is overpriced but appreciably better than the low cost options. I don't have much experience using inexpensive pogo-style shock posts, but I understand anecdotally that they're OK for people who cruise around at low speed and pedal about 40 RPM and don't care about performance. That's fine, those people aren't wrong, but I'm not those people. I'm also not a lycra clad, mirror-wielding endurance cyclist who pushes my body to the point of breakdown on every ride. I'm a casual bicycle riding enthusiast who likes long wheelbase road bikes and gravel bikes. The Creo is my first real aluminum frame bike and I don't care for the rigidity of it, so I was in the market for a solution. This is what I ended up with. I weigh about 170 lbs and I'm using the single spring and have the preload set to about 4. For me, this works pretty well. I do find that if I hit a route that has bumps at just the wrong interval, I will get some harmonic bobbing, but for the most part this seat post does its job very well and is more or less transparent. I don't feel like it robs me of much power, but based on my bike's built in power meter and app, it does (hard to do head to head testing since I'm not a robot and can't output exactly the same one day to the next). I like that if I lean back all the way on the seat, like when I'm stopped at a light, it gives enough so I can get my feet flat on the ground. I get back in riding position and I'm back up in the air another inch or so. It's a very nice riding companion and compliments the FutureShock1.5 already included with the bike; I'm a little surprised premier bike mfgs. haven't come up with their own (proprietary) solutions to this problem! Why not 5 stars? The price. $230 for the "entry level" post is pretty high. Amazon has this one and the high end model, but not the in between model, which is probably the one best suited for my situation, but that costs even more. How much should it cost? It probably cost $40 to build. I don't pay attention to TV or social media but I understand this and other Redshift products are marketed HEAVILY, so it aggravates me that a product I found through research is overpriced to DEATH because they blow all the profits producing highly polished commercials and giving products away to shills. But what else is new. I've got under 100 miles on the post but I'll update the review if I run into any issues. For the money, I expect to be taken care of if anything should happen.
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Reviewed in the United States on June 8, 2024 by BuyerOfThings
After more than fifty years and over 250,000 miles on a bike, this is one of the top three transformative bicycle components I've ever tried. I installed it on my "adventure" e-bike, which has a bone-rattling all aluminum frame and weighs in at over 50lbs. Combine that with a slender individual who lacks natural padding, down there, and you get a situation that sounds like a Yahtzee game every time I hit a bump! I've experimented with several suspension posts over the years, but they all fell short for various reasons. Some were too stiff, providing no discernible benefit. Others were so soft that a significant portion of your pedaling effort was wasted flexing the seatpost spring rather than propelling you forward. And all didn't offer the required range of adjustment or granularity needed to properly fine-tune the suspension to my needs. But Redshift got it just right! You can adjust and fine tune the suspension to your particular performance and stiffness preferences over a large range. What I appreciate most is its smooth and precise action without feeling overly spongy or sloppy. It has never "bottoms out" or rebounds inappropriately after absorbing a large bump for me. There's no noticeable yo-yo effect when you're putting out maximum pedaling effort, and it effectively dampens post-bump rebounding. It's akin to driving a classic Citroen DS with Hydropneumatic suspension! Make sure to follow the installation instructions, especially regarding the seat's fore and aft position and the seat height, as they WILL be different from your usual settings. I intend to purchase four more of these for my other non e-bikes.
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Reviewed in the United States on October 21, 2023 by GrumpyButNice
Size: 27.2mm Dia x 280mm Length
This post is awesome! I've tried more than a few others and this one is the best. Makes me more curious about their higher end model 🤔 but for now this one does the trick and it does it well. The fact that it doesn't change the distance between saddle and BB much if any is the most noticeable benefit to this design. This make it less of a distraction as it works. It just does its thing and my back appreciates it. Does it rob a miniscule amout of power transfer during a sprint, maybe. But my assumption is that if you're looking at this post you aren't that worried about such things. Check out Redshifts website measurements and recommendations and get the shortest post your frame can accept to save a bit of weight. I was able to go with the shortest of the offerings. Once again, Redshift gets the win!
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Reviewed in the United States on February 21, 2026 by locohefe