Home Page

Cart, contains 0 items

When autocomplete results are available use up and down arrows to review and enter to select. Touch device users, explore by touch or with swipe gestures.
Expert Help
Earn Rewards
  • Just In
  • Learn

Seatpost Collar

3.6666666666666665 out of 5 stars
3 Reviews
$27.16 - $31.95
Up to 15% off



Seatpost Collar

Thomson has a fitting reputation for reliable, functional and lightweight components. In the same vein as Chris King, they take their time before releasing a product -- when they do, they've done it right. The Thomson Seatclamp is no different. Granted, most of us don't consider a seatclamp a performance component -- that is, until it's not performing. There's not much worse than being on a ride when your seatpost is gently easing its way down into the seat tube.

The Thomson Seatclamp represents the Thomson values in a sleek, simple, lightweight package. While they admit you probably won't win a race because of it, Thomson engineered this beauty to perform -- the bolt is threaded at an angle, about 1.5 degrees off-center, to help provide awesome clamping force -- they say just 20 inch-pounds on the fastener will suffice. It's available in anodized black or silver in 31.8 or 35.0mm sizes.


  • Aluminum with anodized black or silver finish
  • 1.5-degree off-center threaded bolt
  • 18-gram weight
  • Item #THP0008
Claimed Weight
0.6oz (18g)
Manufacturer Warranty
5 years

Overall Rating

3.5 based on 3 ratings

Review Summary

1 Stars - 1 reviews
2 Stars - 0 reviews
3 Stars - 0 reviews
4 Stars - 0 reviews
5 Stars - 2 reviews

Fits True To Size

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


Selecting an option will reload the available reviews on the page
5 out of 5 stars

April 24, 2022


No seat post slips and matches my Thomson seat post well

Gerard M
1 out of 5 stars

September 29, 2021

Bolt is 3mm not the 4mm in the picture!!

I've used it once or twice and have initial impressions

Bolt is a 3mm not a 4mm. Doesn't hold my brand new thomson post tight in my brand new frame. I can still twist the seatpost by pushing hard on the nose of the saddle. I've got this seatpost clamp tightened as much as I can with this tiny little bolt. Buyer beware the seatpost clamp in the pictures is not the clamp you will get. $30 down the drain :( Check the reviews for the 3mm bolt version on Amazon. I am not the only one to have this issue by a long shot.

Aren F
5 out of 5 stars

September 17, 2021

Typical Thomson

I've used it once or twice and have initial impressions

A well-finished, substantial part that weighs less than it looks. It's got much more contact surface area than my old clamp or indeed any other clamp in have seen, so if all that is in contact, the 2.8nm torque likely will be fine. If it rides high or only has the same contact area as your old skinny clamp, it might slip. I admit that if it slipped I would crank it to 4nm, but hey that's why I keep having to buy seat clamps. For carbon frames, they ask you to seat it with the bolt in the front, which looks a tiny bit wonky but I'll get over it probably. Comes with a nice little bag I keep my Garmin in now in my duffle.

S M45