30.8mm seatpost clamp on 30.0mm frame

Discuss light weight issues concerning road bikes & parts.
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Posts: 33
Joined: Thu Aug 04, 2011 8:18 pm

by Luca79

My Supersix EVO frame is 30.0mm in the seatpost clamp zone.
Is a 30.0mm clamp mandatory or will a 30.8mm be ok?

I'm asking because Tune makes a super light one but only in 30.8mm , and I've heard mixed thoughts about the compatibility.


Posts: 30
Joined: Fri Jul 28, 2017 12:34 am

by CycloTron

Have you measured the seat tube OD yourself, or just going on spec?
The risk you take with a slightly bigger clamp size is the seatpost slipping, especially with carbon ones.

by Weenie

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by kman

The other risk is the clamp cracking.

It seems the Evo is a 30.0 clamp, with a 25.4mm post, which seems like a PITA to me.
The only frames I've come across that use the 30.0 clamp are steel ones like the Surly Crosscheck I used to own. I put a Thomson clamp on that - not exactly a WW clamp though.

Luca79: Do you not have the factory clamp or are you just looking for a WW upgrade?
You can't be a real country unless you have a beer and an airline. It helps if you have some kind of a football team, or some nuclear weapons, but at the very least you need a beer.
-- Frank Zappa

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