Originally Posted by
cyclezen
Seatpost slipping - Make sure the seatpost is CLEAN ! Many put way too much grease on the post - which makes overtightening happen...
Clean the seatpost completely, ALSO clean the Seat Tube throroughly !!! as far down as possible. If you don;t have Carbon paste, use silicon grease. A SUPER-light touch/coat on the post of grease is all you need... After I coat a post, I take a clean cloth and light pull it down the post to remove excess grease - then insert post.
Once you do the Heel on pedal method and find that height - I would wipe the post clean above the clamp, I small square of electrician's tape placed on the seatpost back just touching the collar - if the post slips at all, the tape will bunch/gather up and alert you to slipping... also if you decide to raise a few mm, it'll be an easy reference to where you were, originally.
Yuri
another vote on the tape idea
I’m guilty of using too much grease on the seatpost - and not-a-surprise the seatposts have slipped on my bikes
actually first discovered this when glancing at pics I posted on this forum - the seat height appeared to be low and then realized the post had slipped
initially I used a small piece of black tape to determine if the post slipped - but recently began to use 3M red reflective tape (pictured below)
