Joined: Oct 2003
Posts: 839
Likes: 1
From: philly
Bikes: trek 520 & 736, DeRosa Professional, Fuji Professional, Raleigh International 3-speed, Saronni (any info people?), Humber 3-speed, Raleigh Sports, Carlton Grand Prix coming soon!
i would check to see if the upper pulley is rubbing the larger cogs, which can happen if the chain is too long for the set-up, which is also the cause of your chain slap. shorten the chain using one of the methods described in other threads, then adjust the B tension screw if present and necessary.