Google around for slippage problems with Thomsons in Ti-frames, quite a common issue...
One Masterpiece was actually outside of the published tolerances and refunded. Working solution for me for the others: greased inside of clamp, Finishline FiberGrip paste on post (librally applied) and a Salsa Lip-Lock clamp. I had to torque the clamp a fraction over spec. but since then the bike has been abused and no slipping so far. In my case the clamp seemed to make all the difference over some generic and Thomson ones. Good luck.
Ufgators wrote:Could my problem be that I am using the clamp with the bolt side facing the front of the bike or does it really matter?
Maybe (I doubt it), but I usually line up the bolt (split part of the clamp) with the split in the seat tube. Less friction to overcome when clamping.
Also, if that doesn't solve the problem, I would definitely try another seat clamp. I don't know what clamp you have but KCNC makes a nice light weight alu clamp that works well (as do many others). In fact, if you are having problems you might want to try a non WW clamp with a wide clamp area just to eliminate that as a possibility.
How i solved it:
- Undo the clamp to check where it has the most play between frame and seatpost.
- Get paste for carbon parts and a piece of paper.
- Place the paper on the inside of the frame using the carbon paste, and put carbon past all over the part of the frame that meets the seatpost.
- Secure the paper under the seatpost clamp for a small bit.
- Now you will notice it's a lot harder to mount the seatpost.
- Mine doesn't slip anymore with only 3.5-4Nm on the tiny carbon clamp.
- (i needed 2 pieces because there was a lot of play front to back).
Larger clamps with 5mm-head bolts seem to generate much more torque than 4mm bolts. I've got some post/frame combinations that wont work at all with a 4mm bolt, but work fine with 5mm bolts.
Ufgators wrote:I have a Parlee z0 fitted with the proper size Thomson masterpiece seat post and I notice that the post slips a
Couple millimeters per a 2 hour ride with 6nm of force on the clamp and a generous coat of carbon paste. Any suggestions? Thanks
Don't use a generous amount of paste. As you'll eventually get a lubrication effect out of it. Tacx is quite greasy.
Thomson posts already have graduations in the tube surface to increase contact area (hence friction) with the inner wall of the seat tube. You can install the post without compound. But if you apply too much paste, you may effectively be smoothing out the surface.
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