- Well, since you've got thumbshifters, I'd first try switching to
friction mode (the little lever on the side of the right shifter),
which lets you trim cable length continuously, rather than "clicking"
Some other things to check would be:
* tightness of rear cassette (or freewheel) -- sometimes you need to
add a 1mm spacer to get the cassette to lock down tighly on the hub.
If there is any play in the cassette, resolve that first. Especially
since you just switched cassettes -- it's very common for them to
have slightly different widths, so the locknut engages before the
cassette is clamped down.
* straightness of the derailleur hanger. On your steel bike (sweet
frame, BTW!!!), it's integrated into the frame, but can still become
bent slightly. Good shops will have a Park tool to check alignment,
or you can roughly eyeball it.
* make sure the chain doesn't have any protruding rivets along its
length -- especially since you have two chains attached to each
other. (and make sure they're the same type of chain, and that you
don't have a length of old chain attached to some new chain with less
* the Park tools site has pretty good tips for adjusting your rear
derailleur -- I assume you've gone through and set the H and L screws
and the B screw (to adjust the angle of the derailleur body), but it
never hurts to start over and get everything dialled in properly.
Jeff Ong, Managing Partner, Leadcleaner (http://www.leadcleaner.com)
Web-based lead capture and qualification for direct marketing professionals.
Contact: ong@... or 503.239.7264