I'm having front end shifting probs, and I think it's the shifter. It was
becoming increasingly difficult to shift from the small to the large
chainring, until this weekend it failed. The derailer cage moves toward the
larger ring, but will not move the chain, unless I take two swings, and even
then the shift is not guaranteed.
I don't think it's the derailer adjustment. I've tried working the low and
high end der adjustments accordingly and only end up over-shooting the high,
for example, in trying to get the chain to move. I think the derailer is
fine.
I think it's the shifter. __I have had to move the swing arm farther than
normal in order to shift to the large chainring.__ I recently mentioned
that like another poster, the swing arm on my left-hand 2002 Chorus 10-sp
ergo shifter extends just a bit past the brake lever (may or may not be
relevant). It has for at least a year. There was a hairline crack (again,
may or may not be relevant) in the shifter housing that my LBS suggested
trying superglue to seal. It worked (nice). Unfortunately, the swing arm
still went too far when shifting to the large ring. I replaced right and
left G-springs recently, and while I got the nice click back, it didn't
correct the shifting problem. (I realize some don't bother replacing
G-springs in left-hand shifters.)
This morning I did a dis-assembly/reassembly of the left shifter, all except
the front-most section, which I looked at carefully but did not break down.
It appears fine.
I would sort of rather not spring for beautiful new Chorus carbon 10-speed
shifters. Another Campy-phile here in British Columbia has told me the
ratio of Shimano to Campy is 50:1. Good Campy help is hard to find.
Components run twice American prices it seems. If I can't fix it I may send
it to Peter C. to see what he can do. Any suggestions?
Thanks.
JF