I had one of these… a Thomson that slipped down whichever frame I put it in. I successfully sorted in in a two stage process.
Stage 1 : I bought some of that carbon "grease" that folk with expensive frames and seat posts use so the two carbon faces get some friction. This slowed the process down quite a bit but not entirely.
Stage 2 : I got a different frame and now it is as solid as a rock.
(The new frame was incidental BTW. I had fitted the post to 5 different frames before the last one. I was at the stage of chucking the damn thing away if it has continued slipping!)Posted 7 years agomiketuallySubscriber
Are you a regular seatopst dropper? If so, you could have worn the inside of the seattube slightly.
Or, you could have 'overlapping' manufacturing tolerances, so you've a slightly oversize seattube and a slightly undersize seatpost.
Is it a 27.2 post? Ragley are making some 27.3 posts for just such a problem.Posted 7 years agomatthewlhomeMember
i had this with different QRs too. Got some carbon assembly paste on the seatpost, and also put a little bit between the outside of the frame and the clamp itself. This has worked nicely and requires lots less force to close.
Also make sure the cam etc are nice and clean – maybe a spot of grease or coppaslip on them.Posted 7 years agomissingfrontallobeMember
My QR has a curved plastic washer under the QR arm, and this has cracked. The result is that the post has now started slipping. I'm in the market for a new QR, people seem to get on with the Salsa one, so it might be worth checking that the QR itself hasn't failed.Posted 7 years agojoolsburgerMember
It's the right size and so is the Hope QR but no matter how tight I do the thing up it creeps down and inch or so over a ride. Ideas on how to stop it would be welcome, can't shim it as there is no room. Need a QR as I often pop the seat off for transporting the bike.Posted 7 years agoclubberMember
I've had exactly the same problem with Hope seat clamps on various combinations of seatpost/frame. I think it's because of the smaller M4 bolt that Hope use compared to some which use an M5 which you can do up tighter. Hope + oversized frame or undersized post = slippage.
Fixed it on my current full susser by swapping the Hope for an M5 bolt one. FWIW, bolted ones tend to do up tighter than QR.Posted 7 years ago
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