I have a road bike with 2002 Campy Chorus 10-speed components. For the last 10 years or so it's not had any problems with shifting--everything worked as it should.

A few months ago I replaced the chain with a new Campy 10-speed chain cut to the same number of links as the old chain. Immediately after replacing the chain, the bike started exhibiting a strange shifting issue that I can't figure out.

Whenever I'm in the small chain ring up front and shift the rear more than a single cog at a time, going in either direction, the chain comes off the front chain ring and drops onto the bottom bracket. This, of course, requires stopping and putting the chain back on. If this happened once in a blue moon it wouldn't be so bad, but it's happening 3-4 times on every ride and it's getting to be a PITA.

I have the front and rear derailleurs adjusted properly. In fact, I didn't change the adjustments at all after I replaced the chain and the bike shifted perfectly before the chain replacement and never threw the chain. I removed the chain and checked for sticky links and obvious damage, but didn't find any.

Anyone have any ideas what may be causing this? This one is driving me crazy!