Seat keep creeping down during ride!

Had the same problem. Tried everything I could think of...cranked down the bolt on the QR clamp (to the point it destroyed the plastic grommet) put lock tite on the bolt, roughed up the post with sand paper, etc. Finally bought a Salsa QR clamp and it hasn't slipped since.

try using a thomson post instead of the illegitimate thompson brand.

just kidding. those salsa qr clamps are a very good option if you want to try something different.

Are they a special QR, as the other one is shape to sit in the frame...

Quentinfarquar said:

Are they a special QR, as the other one is shape to sit in the frame...

Click to expand...

No, it's a standard round QR. Obviously, without the curved shape, the collar doesn't sit completely flush and leaves a small gap at the back of the seat tube. I email pictures of the gap to Ibis and they didn't seem to think it was a problem.

friction

You could try some carbon assembly compound. Even though you have an Al/Al interface it will still incease the friction and help the post stayput with less torque on the collar.

I have a Thompson post. I had the same problem. Got some carbon assembly compound and never had an issue again. Good luck.

Check to see if the ends of the seat collar are touching together when the QR is tightened down. I have this same problem and had to wedge some aluminum foil between the seat tube insert and the QR.

That's what I used

d3toid said:

You could try some carbon assembly compound. Even though you have an Al/Al interface it will still incease the friction and help the post stayput with less torque on the collar.

Click to expand...

It stopped it.

Same problem with the Thomson post, even using FSA carbon paste. 1/8 turn on the seatpost clamp is the difference between a post that twists/drops when I bump it on rough terrain, and a definite creak/click sound that only went away when I loosened the post clamp bolt. Think it has to do with the ridges on the Thomson post as I didn't have a problem with the previous (and probably future) Easton post. Problem is that I really like the set-back Thomson. Any other suggestions?

I used a Coke can. Cut it up to make a shim. Wrap 3/4 around the post about 2 inches long. It took a little bit of time to get it just below the top of the seat tube but it has not slipped yet.:thumbsup:

I used that "abrasive grease" - it's red grease with micro (silica?) particles in it for grip... worked like a charm. They sell these little "single serving" packs for cheap...