Originally Posted by mcavana
i have a 2004 trek 6700. the seat post has a tendency to slip down a tiny bit every 3 or 4 rides. today my legs didn't feel so good on the way home. when i got home i measured the seat hight, and sure enouph it dropped about 3/4 of an inch. i have the lithium grease on the seat post, because without it the post somehow makes a ticking noise. keep in mind i weigh 265 pounds. I am tightning the quick release about as tight as i can get it... have to really push to close it. would a non quick release bolt fix my troubles? any other suggestions?
Hi
A common problem. As you are 265lb, get rid of the Quick Release clamp and install a normal 5 or 4mm allen key bolt clamp. There are a number of soloutions to the slippage if this does not work. Make sure the post is not a slack fit or you will end up cracking the frame! These soloutions will also stop the ticking noise.
1.Clean off the grease on both the seatpost and inside of the tube. Smear seatpost with Loctite 222 low strength (purple) threadlock, available from friendly engineering stockists in 6mm tubes. This will set gently and prevent the seatpost slipping, but allow you to easily get the post out in the future. It will also prevent corrosion of the post or frame as it excludes air. It sets when you tighten up the clamp and air is excluded. This is the best cure. Don't use other threadlocks if you want to remove your seatpost later!!!!!
2. Find a workshop with a 'Stein' Knurler which will put a criss cross pattern on the seatpost and prevent the slipping.
3. Rub the seatpost with candle wax or beeswax and install. This will grip better and still prevent corrosion.
There are a number of other 'dirty' ways to do things to seatposts /frames to stop them slipping but I will not upset the engineers who view this forum!!!
Hope this helps