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I have had this going on for ages , my mate mentioned his doing it over the weekend too, anyone got a solution to this issue?
If i tighten the clamp anymore the pin will snap.
Should i have grease in the post hole or not ?
anyone had the issue and managed to sort it ?
try carbon assembly paste.
if that doens't work try another post (Thomson are quite good - the ribbign seems to help stop slip) - some come up just under and the seat tube may be just over.
How do you know the bolt will snap ?
What kind of clamp do you have. I rememeber on my old bike the original clamp decided it wasn't going to hold my weight anymore and would gradually drop the seat. I upgraded the seat clamp to a hope one and it was fine from then on.
You can buy gritty grease (vaseline with sand in it) - works fine for me
If it's a 27.2 ragley do a 27.3 post now for just this problem,
But as above, try a new clamp first.
Coke can shim, if you have space?
I treated myself to a Salsa QR seatclamp and it solved this problem for me (even though my seatpost is very old and worn)
If your seatpost is too worn from repeated dropping for descents in the mud then you might need a new one unfortunately
Some grease on the collar bolt threads can help, believe it or not. Sometimes you think you're bolting it up tight and you're actually not. Worked for me when I had a slipping seat post on a Cotic Soul.
i used chalk powder on my niner, just i take it out regularly so it doesn't seize up
One of them double height clamps on CRC ?
BMX seat-clamp around the post itself ?
- tighten the bolt more
- carbon assembly gel
- new seatpost
- new clamp
My fat ass managed to snap a hope qr clamp in half, not the bolt, the clamp 😆
Take the post out
Clean the post thoroughly, and the inside of the frame with a rag and some WD40/TF2/GT85 and allow to dry.
Dissassemble the clamp and clean it, re-assemble with grease on all threads and moving parts.
Apply fibergrip or simiar assembly paste to the seatpost, this acts like a lube normaly but actualy increaces friction when you apply pressure to it.
Do the seatclamp up normaly, apply some grease between the seatube and the clamp.
Sorted my (carbon) slipping seatpost last weekend with a cut up tin of Tennents (tested with a very wet 18 hour ride, worked a treat).
I used a double height clamp bolt up seat collar on my old bike (around £6 i think) when i just could not get a shimmed seatpost to stop twisting. It worked fine but they do look a little 'agricultural'
[i]I treated myself to a Salsa QR seatclamp and it solved this problem for me[/i]
That
the thing to bear in mind if taking the 'clamp it tighter' approach is that the the seatpost is designed to be a very snug fit in the seat tube for its whole length.
If the seatpost is slightly under sized (or the seat tube over) then there will be a lot of force on the seatclamp area that would normally be more evenly distributed.
As above really. If it's not snug all the way down it could overly stress the steat tube. If you're going to stick with it then Salsa clamp and carbon assembly paste solved a slipping Thomson for me.