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Bicycle Mechanics - Grinding feeling in pedals when in easiest gear

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Bobdohm31

01-09-04, 07:16 AM

VegasCyclist

01-09-04, 08:08 PM

I have 8sp campy chorus components(older ergo). When I'm in my 21 tooth gear and the small chainring(42) I can feel a sort of grinding or ratcheting in the pedals. There isn't any noise but I can definately feel it in the pedals. It disappears when I shift to the 19. I brought it to the local bike shop and he said my chain was stretched out so I replaced it and it help but it came back again. Could it be that I need to replace my 21 tooth cog, chainring and chain?

maybe, how many miles do you have on the drive train? a lot of times when you replace a chain on a older drive train the worn out teeth on your cogs can make problems presist. Another idea may be to double check the pedals themselves, and make sure that the bearings in them are not worn, or in need of lube...
it is hard to say for sure without looking at the teeth on the cogs IMO..

Brian Ratliff

01-12-04, 12:06 AM

I could possibly be that the top guide wheel on the derailler is hitting the teeth of your cog. Shift into this gear and check to see if this is the case. The grinding comes from the teeth of the guide wheel hitting the teeth of the cog. The way to fix it is the adjustment screw on the derailler in the back (not the adjustment for the cable). This screw touches the frame of the bike and varies the angle of the derailler with respect to the bike and will move the guide wheel away from the cog.

BR