I wonder if anyone can suggest anything here?
On both bikes (commuter and a rockhopper) the seat post slips. A lot. On the commuter I can loose about 1/2" in 10 miles and on the rock hopper it seems to drop the same in a mile!
Both use 30.9 seatposts. I have tried replacing the seatposts, its the same. I have shimmed the commuter to 27.2 and tried a 27.2 post. Its the same. I have replaced the quick release clamp on one with a bolty one and no matter how far I torque it the post still slips!
I am using a bit of grease on assembly - should I be putting them in dry perhaps? Its Finish Line BB/hub grease (only one handy in the shed).
I am just under 100kg and I have a fair bit of seat post showing on both bikes.