Subject: RE: seat post slippage I got my first road bike about 4 weeks before my first race. I got everything set up the way I wanted and trained the hell out of those 4 weeks preceding the race. Took the bike into the LBS 2-4x for slippage adjustments and then came race day. Leading up to the race I was riding around 18.5 mph. On race day I had a 17.8 (as I recall ) avg speed. Couldn't figure out for the life of me why my time had dropped so much. As I looked at some of the race pictures, the "riding a big wheel" that you called it was what I was seeing in my pictures. I found my seat post had gradually slipped over 4 weeks by about 3-4 inches. I'm determined not to have the same mistake for my next race next week!!!
Things I've done to reduce slipping are tightening the screw "slowly" until I feel a little slight pop. The user manual for my bike gives a max torque for that screw but since I don't have the proper tools, the pop feel seems to be working and the seat post doesn’t look damaged. Also, get used to checking the middle of the crank set to the top of the post measurement. My seat post is black but I found I could mark it with a sharpie and still make out the mark...made it much easier to see if it had slipped.
Other than this I'm looking for more info on this same subject.
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