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

Familiarity:

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

Fit:

True to size

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.

Typical Thomson

Familiarity:

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

Fit:

True to size

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 McBean

Sturdy and Well-Built Seat Collar

Familiarity:

I've put it through the wringer

I has issues with my OEM seat collar and wanted to replaced it with a Thomson. Replacing the OEM one was a breeze and Thomson's instructions were a breeze to follow. The only reason I gave it 4 stars is because Thomson recommends not exceeding 2.8 NM. I did this and my seat post still moves around on me. If not for my frame being carbon, I'd torque the collar down a little more.

Cef C.

Warning - hex bolt is 3mm, not 4mm

Familiarity:

I've put it through the wringer

Every other seatpost clamp uses a 4mm hex. Not sure why this one is 3mm

DANIEL C.

Elegant and Simple

Familiarity:

I've put it through the wringer

I have used Thompson on a few of my bikes, Surly Cross Check, Wife's Surly Troll and my new TI 29+. Thomson has done nothing but impress, don't think twice upgrade your components.

Josh R

Much better than any stock clamp

This and the Salsa clamp are both great performers. Broke the factory clamp on my 2016 Cannondale Supersix. Had a Thompson 28.6 clamp in my toolbox. Even though the dia. spec is a little different the Thompson is holding my post just fine. Going to order another as a spare.

Stephen H.

Us made brilliance

A seatpost clamp may not be the first thing you may think of to upgrade on your bike, but if you're running a Thomson stem and post, might as well go all out! It comes with a tiny 3mm hex head bolt, but the design of this will keep your post secure.

Tommy Liao

Great little clamp

Thompson is usually more expensive than their competitors but for good reason. This is a great little seat post clamp. It's clean looking, very light weight and gets the job done.

Andrew Brook

Thomson....Nuff said

Familiarity:

I've put it through the wringer

I rock Thomson stems and seat post on all my bikes. This is the first time using their seat collar. As all of their other products it has beautiful craftsmanship. Just can't go any better for performance and price.

David Yath

It Works

Familiarity:

I've put it through the wringer

It is a seat post clamp. It looks nice, it's light and my post hasn't slipped. About all you can ask for from a clamp.

DanW

Solid Clamp

Familiarity:

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

I'm amazed at the low torque needed to get such a solid hold. I'm guessing this will lessen the chances of ever having to replace it. The last clamp I had popped at 5nm torque. The threads pulled out of the clamp body. This Thomson clamp specs only 2.8nm torque, and it is holding really strong! This is a great seatpost clamp!

Michael S.

Thomson Seat Post Collar

Familiarity:

I've put it through the wringer

I swapped my factory clamp for this. It really cleaned up my bike and the quality is unbeatable. Great product!

Tj Johnson

It's the little things...

Familiarity:

I've used it several times

Seat collars are simple and only have one job-keep your post from slipping. It is surprising how often something as simple as a seat collar is done badly. Either the collars don't keep the post in place or the collar itself is susceptible to breakage. The Thomson collar will not let you down. It is light, it is dependable and elegant. I would say that this simple collar design and finish boards on usable art. Upgrade your bike now!

Brett Cole

Clean and good looking

Got this to replace one that came on the bike. This one looks good on the bike and feels solid. You can 't go wrong with this.

Jodie A.

is the measurement referring to the inside...

is the measurement referring to the inside diameter? my bike seat tube is 31.8 internally so the seat post clamp should be the larger diameter?

jesse fortin

That added bling

Familiarity:

I've put it through the wringer

Thomson Post?-Check Thomson Stem? Check Thomson Bars?-(YEP they make bars!) Check Thomson Seat Collar?- NO?!?! What is this, amateur hour? Add that added bit of bling, you know you want to, your bike will thank you.

Perry Hall

Solid piece, set it and forget it

Would have given this a 5 if it was a little lighter or a little more economical. Lets be honest, the only reason 95% of us upgrade from stock is to save weight or add bling. This part is anti-bling but lighter than your average QR factory clamp, but I replaced it on my latest build with a titanium unit weighing 10g that was half the price, so.....

Madsedan

If my frames seatpost size is 27.2mm ,what...

If my frames seatpost size is 27.2mm ,what would be the normal clamp tube size?

Darel H. P.

I need a clamp for a 63CM Serotta (road...

I need a clamp for a 63CM Serotta (road bike) w/ a Ti frame - 31.8. I’m using a Thompson 30.9 seatpost, will this fit the fame and clamp down the post? Is there a return policy?

Doug