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Thudbuster ST

Shock Absorbing Seatpost - $199.99

Bolt-On Comfort

  • Comfortable Suspension: 50mm of Travel (1.97in) for exceptional shock absorbing while cycling.
  • Reduce Riding Pain & Increase Comfort: Absorb bumps, dips, and drops. This will soften your ride and make biking more comfortable and enjoyable so you can ride longer.
  • High Quality & Durable: This suspension seatpost is completely redesigned from the previous model for increased durability and additional suspension travel.
  • No Shop Tools Needed: Tool-free elastomer change and a single-bolt seat clamp design for easy seatpost adjustments.
  • Works with Many Different Bike Types: This seatpost can be used on road bikes, gravel bikes, e-bikes (electric), commuter bikes, and adventure bikes for maximum comfort and performance.
  • Wide Range of Rider Weight: Weight limit of riders up to 115kg/330lbs.
  • Patented Parallel-Linkage Technology: Parallel Linkage technology stays in the direct path of the natural travel of the rear wheel. As a bump lifts the back of a bicycle, the rear wheel pushes up and forward into the rider.
  • Tuning Customization: Tunable to match your weight and riding preference with a range of elastomer spring rates available.

For over 20 years, Thudbuster has been the bicycle industry standard in suspension seatposts by providing unequaled comfort and reliability to riders around the world.

Thudbuster ST Seatposts are back in stock! Get one while they last!

Thudbuster ST

Suspension Seatpost

The latest generation Thudbuster ST is superior to its predecessor in every way.  Building on Thudbuster’s proven parallel linkage technology we have completely re-designed the seatpost for increased durability, a higher rider weight limit, and additional suspension travel, as well as ease of use through tool-free elastomer change and a single-bolt seat clamp design.

By improving on this already legendary design, we’re confident to say that the newest generation Thudbuster is the most advanced suspension seatpost ever made.

Cane Creek Thudbuster ST Installed on a

Better Than Ever

Designed specifically with the rigors of e-bikes and daily commuting in mind, the latest generation Thudbuster ST includes 50mm of travel to significantly diminish shocks and impacts from broken pavement, cobblestones or any other mixed surfaces.

Cane Creek Thudbuster ST suspension seatpost


Thudbuster ST is now able to support riders up to 330lbs (150kg) and incorporates a tool-free, interchangeable elastomer system to quickly and easily adjust the seat post for a variety of rider weights.

Parallel Linkage Design

The Thudbuster Parallel Linkage technology stays in the direct path of the natural travel of the rear wheel. As a bump lifts the back of a bicycle, the rear wheel pushes up and forward into the rider. The Thudbuster works by compressing along the exact opposite path — down and rearward — absorbing force at the same rate. This results in a natural suspension feel without being overly active, and allows for more travel without compromising pedaling position.


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Additional information


0mm (unweighted)


Forged aluminum

Seat Clamp

Single bolt fastening and angle adjustment design


Threaded, serviceable, hard anodized aluminum axles flanged PTFE bushings


Medium firm elastomer pre-installed from the factory. Soft and Firm elastomers included. Extra Soft and Extra Firm elastomers sold separately


50mm / 1.97in


27.2 – 345mm.  30.9 + 31.6 – 375mm


580 grams (31.6)

Max Rider Weight

330lbs / 150kg


Minimum – 100mm / Maximum – 274

Diameter (Direct Fit)

27.2, 30.9, 31.6
(additional diameters available with seatpost adapter)


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Q & A

Hello, I want to buy and I don’t know if the device will suit me. I weigh about 130 kg and decide between buying st and lt. Do I need to buy other elastomers or is the standard one in St right for me? Cyr asked on August 11, 2023

We have a maximum rider weight of 250lbs for the Thudbuster LT so the ST "short travel" option would be best for you. You will need the Extra Firm elastomer as well for the most comfortable performance. This is part number: AAE0270-80

Ben Rea answered on August 15, 2023 store manager
(1) (0)
What suspension seat post would you recommend for the stoker or rear rider on a tandem? Jeffrey Huckle asked on August 3, 2023

Since the Stoker's seatpost does not have to include a stoker stem, you can use any of our seat posts as long as the maximum and minimum insertion suit your needed saddle height. Many riders choose the Thudbuster ST but we have suspension seatposts that offer compliance from 20mm (eeSilk), 35mm (eeSilk+), 50mm (Thudbuster ST), and 75mm (Thudbuster LT).

Ben Rea answered on August 4, 2023 store manager
(0) (0)
Does the Thudbuster ST work with saddles that have oval carbon rails, i.e. Reform 'The Seymour' saddle? sputnikkoll asked on May 28, 2023

The Thudbuster seatposts are designed to work with rounded rail saddles. We have not tried them with these saddles you have mentioned but I see them used on other seatposts using a traditional clamp so I do not see why they wouldnt. We have not tested to be 100% sure but it appears they would fit.

Ben Rea answered on May 31, 2023 store manager
(0) (0)
How much distance is required from seat rails to bike frame seatpost mount? Daniel Lacasse asked on April 18, 2023

The maximum extension of the Thudbuster ST is 274mm for the 30.9mm & 31.6mm sizes and 244mm (27.2mm).

Ben Rea answered on May 8, 2023 store manager

the question is not answered. minimum distance from seat post to seat rail mount. in other words if the seat post is at its lowest level what is the distance to the seat mounting rails. again how much height does this add to a seat on the bike.

john answered on July 4, 2023

The measurement you are referring to is called the ""maximum insertion"" which is the maximum the seat post can be inserted in the bicycle and still allow the suspension head to work. The measurement from the saddle clamp to the base of the suspension head aka ""maximum insertion"" is 101mm for the Thudbuster ST. If this still does not answer your question, please give us a call or send an email to and we can better help you.

Ben Rea answered on July 6, 2023 store manager

4 inches minimum

Eddie ZipperHead answered on August 8, 2023
(1) (3)

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Technical Documents

Related Reviews

Gerald H.
Verified OwnerVerified Owner

installed on my touring bike -- definitely improves the ride on bad roads!

Verified reviewVerified review - view original

1 week ago
Paul S.
Verified OwnerVerified Owner

This seat post was worth every penny. Almost as good as rear suspension. Added a lot of comfort.

Verified reviewVerified review - view original

3 weeks ago
Verified OwnerVerified Owner

No clue if this works.

Verified reviewVerified review - view original

3 weeks ago

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Reed Mann

Design Engineer
Name: Reed Mann
Position: Design Engineer
Year started: 2022
Best part of being a part of the Cane Creek family:  It’s very refreshing to work for a small, tight-knit company where we all share the same passions and to develop new products that make cycling better for everyone.
What you’ll find me doing on the weekends: Obviously riding bikes, but also wrenching on bikes or cars, exploring the mountains, and watching F1 races.
How I got here (at Cane Creek): Feeling pretty unfulfilled with a corporate engineering job, I happened to see that Cane Creek was hiring. I jumped at the opportunity to get my hands dirty working on the latest bike tech and was fortunate enough to be offered the position.