Michigan Mountain Biking Association
Thomson sent me a replacement post that was more toward nominal diameter and my slipping problems went away
meangreen wrote:Thomson sent me a replacement post that was more toward nominal diameter and my slipping problems went away
But if the post measures OK, I would go with a beefier clamp like a salsa lip-lock/thompson etc.
Kampfire wrote:I'll take home my calipers from work and measure. The tolerance from Thomson's website say +0.0/-0.03mm. Thats crazy tight!
I had a Niner RDO Carbon seatpost on it when I first bought the bike. It lasted all of about 3 months and cracked right at the seat clamp. It slipped and creaked as well.
Kampfire wrote:I have the 400mm seatpost. I'll double check that as well. I'm thinking I have about 50mm left before the max line.
Kampfire wrote:OK, here are the measurements my 31.6mm seat post. I did 3 sets of measurements. Top about 50mm below the saddle. At the clamp point and at the base of the post. X is parallel with the frame and Y is parallel with the handlebar.
Top: X: 31.67mm Y:31.68mm
Clamp: X: 31.30mm Y: 32.01mm
Bottom: X: 31.52mm Y: 31.56mm
*Measurements taken with Mitutoyo digital caliper.
So obviously the clamp has ovaled the seatpost. Looking at the bottom measurement it may appear the seatpost was undersized from the factory?
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