ShockStop Suspension Seatpost

Regular price: $229.99 USD
Sale price: $229.99 USD

graph indicating shock reduction from installation of suspension seatpost

ebike, road bike gravel bike and mountain bike suspension seatpost application,

ShockStop Suspension Seatpost

Regular price: $229.99 USD
Sale price: $229.99 USD

The patent-pending ShockStop Suspension Seatpost provides 35mm of tunable, ultra-responsive suspension travel for the ultimate bump-eating comfort. Ride further, faster, and more comfortably on the bike you already own, while the ShockStop Suspension Seatpost lets you float over rough terrain.

Is your seatpost larger than 27.2mm? We've got you covered - just add the shim that matches your seatpost diameter and the ShockStop will fit perfectly with your bike. Don't know your seatpost diameter - no worries, just email us at support@redshiftsports.com and we can help.

Seatpost Diameter & Length

Need a Seatpost Shim? *

What is a Suspension Seatpost?

A suspension seatpost is a specially designed bicycle seat post 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 applications but are also used on road bikes and tri-bikes to help riders stay in the saddle through rough course areas. Suspension seatposts are often used on e-bikes as well, especially in urban environments with shifting concrete conditions.

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 further, faster, and more comfortably.

Benefits of a Suspension Seatpost

• Go further - seatpost suspension helps to reduce fatigue from bumps and vibrations with a superior shock absorber.
• Ride faster - energy that is normally wasted suspending your body is converted into forward motion.
• Take control - customize your suspension seatpost feel to float over obstacles and maintain control

Suspension Seatpost Features

• The ShockStop Suspension Seatpost is available in two length options:
- 280mm and 350mm

• 35mm of active suspension travel

• Infinitely adjustable stiffness via pre-load adjustment and swappable springs

• Adjusting stiffness / pre-load does not reduce travel

• Swappable springs included to accommodate heavier riders and/or ride preference

• Optimized linkage geometry provides ultra-responsive suspension feel

• Check technical specifications for compatibility

What's in the Box:

• 1 x ShockStop Suspension Seatpost
• 2 x springs (1 pre-installed, 1 included in box for increased stiffness)
• All required hardware

Diameter	27.2 mm (shims available for larger seat tube sizes)
Length	280 mm (11 in) 350 mm (14 in)
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 350 mm – 547 g - w/main spring
Rider Weight Limit	110 kg (242 lb)
Material	6061 T6 Aluminum Alloy
Saddle Rail Compatibility	7mm round & 7x9mm oval
Di2 Battery Compatibility	Only compatible with the 350mm length (requires mount kit sold separately)

What is the minimum and maximum insertion depth and clearance for the ShockStop Suspension Seatpost?

What length should I choose? 350mm or 280mm?

350mm is our standard size, but we developed the 280mm 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 seatpost. If not, order the 350mm size.

What kind of saddle bags can I use with the ShockStop Suspension Seatpost?

Most standard strap-based saddle bags will fit the ShockStop Suspension 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.

Is the stiffness of the ShockStop Seatpost adjustable?

Absolutely - We designed the ShockStop Suspension Seatpost so that you can adjust it to perfectly match your weight and riding style. The Shockstop Suspension 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, click here.

Download Instructions (PDF):
Instructions - ShockStop Suspension Seatpost
Instructions - Di2 Battery Holder for 350mm ShockStop Suspension Seatpost

Installing the ShockStop 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

"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

"DO I RECOMMEND IT? YES. WHAT REALLY COUNTS IS EVERYDAY COMFORT, AND REDSHIFT SUSPENSION SEATPOST DEFINITELY DELIVERS THAT!" - GRAVELBIKES.CC

"THE SHOCKSTOP SEATPOST REVOLUTIONIZES THE WAY YOU RIDE YOUR BIKE. IT'S SIMPLE AND, MORE IMPORTANTLY, WORKS LIKE A CHARM." - JORDAN CARTER, GEAR HUNGRY

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