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Colnago C-40 seat-post slips(3 posts)

Colnago C-40 seat-post slipsyzfrr11
Apr 14, 2003 6:12 PM
Does anyone else have this problem? I crank down the seat-post clamp faily tight but after about 6 miles, the seat is about 3mm lower.
re: Colnago C-40 seat-post slipsHigh Gear
Apr 14, 2003 7:05 PM
Your not using any grease on the post are you? Is it a carbon Colnago post? I've had problems with stems slipping on carbon steerer tubes and solved the problem by wraping some 80 grit sandpaper around it and turning the tube twice around. This will give it a "record like" finish that will help it grip better. Don't worry it's safe to do.
not uncommon...C-40
Apr 15, 2003 4:25 AM
Be sure you have the correct 28.0mm seat post, not a 27.2.

I've had a slight problem with the post slipping. Lightly sanding the lower section of the post (where it won't show) with 120 grit sandpaper may help.

You may also want to lightly sand the inside of the seat tube. There could be something sticking up the prevents full contact between the seat tube and post.

As already noted, no grease is required.