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Chain fall-off(6 posts)

Chain fall-offcolnag40
Jul 19, 2002 6:31 AM
Have C-record 10 on C-40. In recent ride went to hammer down while in big ring, and in 13 or 14 in rear and the damn chain, which was running smoothly, jumped out of the 53 upfront falling off the pedal side. Most disturbing and almost landed in a ditch. Any ideas what might cause such. Wondering if it is needs a slight adjustment in front derailleur, or am I getting to much flex in C-40 down at bottom bracket. PS I weigh in at 165 lbs.
re: Chain fall-offDougSloan
Jul 19, 2002 6:55 AM
Probably just the limit screw. A little odd if it happen when you were not shifting to the big ring, though. Could be the front derailleur cage is not aligned correctly. Could you have caught the chain with your foot somehow and pulled it off?

I can't get *any* flex out of mine, much less enough to auto shift.

First thing I'd try is to screw in the outer limit screw, even to the point that it rubs the chain just a little when in the smallest cog.

Doug
adjust your limit screw (nm)ColnagoFE
Jul 19, 2002 7:05 AM
Definitely the frame!grzy
Jul 19, 2002 11:32 AM
You'd best send it to me - what size is it? ;-) Could be that Campy 10 stuff - I heard it's not as good as Shimano, wanna trade?

Seriously it's nothing more than setup of the drive train. Could be anyone of a number of things. Start by cleaning everything with citrus based degreaser and get rid of any build up. Hopefully you don't use White Lightning otherwise you have to use their special removal product - or some floor wax remover. Look to make sure the chain isn't shot. Then the chain rings. Make sure the deraileurs don't have excessive play. Ditto for the chainring bolts, crank arms and the BB. It's most likely the high limit screw, but it could also be that the cage isn't perfectly parallel to the crank. What we're really talking here is a full tune-up, routine maintenance really. High end bikes need love and attention just like everything else - otherwise all the stuff wears out and gets sloppy and slowly chews itself up. Ain't nothing wrong with the equipment unless you neglect it.
re: Chain fall-offcolnag40
Jul 22, 2002 8:33 AM
Thanks for the replies everyone and yes, I do care for her tenderly. Will take closer look at limit screw. Did do minor adjustment on it, results not what I hoped for, but will continue to fiddle with it.
Colnag40
re: Chain fall-offKen
Jul 23, 2002 11:51 PM
Probably have the same setup as you. My C10 chain would fall off to the pedal side. Most of the time when overshifting from the 39t chainring. One time it fell off when I hit a bump. What I did was put the bike on the stand and disconnected the cable to the FD and made sure it was aligned according to specs. I then reconnected the cable and spun the cranks while shifting from small to large chainring. All the time observing how far the FD was moving outward and what effect it was having on the chain as it climbed up (over and off). Fiddled with the limit screws until I got it just right. Got it down now.