Bicycle Mechanics - Chain rubbing front derailleur cage when backpedaling
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Hi--I hope this topic hasn't been covered before endlessly---the search function is not working properly, or else I am failing to use it properly.
As the title of the thread says my chain rubs the front derailleur cage when I backspin the pedals, but not when I actually pedal. Why is this? Is there something I can do about it (besides not backspin in high gears)? Thanks!
Clean & lube chain and adjust the derailer.
12-25-07, 09:15 AM
It's not a problem if it doesn't rub while pedalling forward. If it bothers you a lot you could adjust the fd's high limit screw or tighten the shift cable slightly as long as that doesn't mess up the shifting.
12-25-07, 09:32 AM
If it only happens when using small/small combinations, then its likely the chain hitting the pin that connects both side rails of the front der. Check to see that the chain legnth is correct, too long a chain will give too much slack which is only evident when you backpedal.
But be careful if you need to shoten the chain, you have to set the chain legnth to make sure you have enough chain for the big/big combo, if its too short for that combo, you will rip off the rear der.
12-25-07, 09:51 AM
Also, when you backpedal there's no tension on the chain as it passes through the FD cage. That lets the chain flop around more than when pedaling.
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