Joined: Jun 2011
Posts: 1,180
Likes: 0
From: Sunnyvale, California
Bikes: Bridgestone RB-1, 600, T700, MB-6 w/ Dirt Drops, MB-Zip, Bianchi Limited, Nashbar Hounder
Have you tried to tighten the nut a little and re-clamp the seat post QR? That might work and get the post tight enough so it doesn't slip.