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mystified by grinding sensation(5 posts)

mystified by grinding sensationWhoWasThat
Sep 2, 2003 9:36 AM
I'm stumped, so I thought I'd post.

When I get into a small cog in the rear (53/14, etc.), while in the big ring, I feel a vibration/grinding sensation coming through my pedals, like it's in the cranks, like the bearings are dry in the BB.

Go back to a larger cog, say 53/19, and it's gone, smooth sailing. I'm puzzled.

Thanks!
Could the chain be rubbing on the chainstay / dropout? (nm)TJeanloz
Sep 2, 2003 9:53 AM
Is your front deralier bent or out of whack? -nmcydswipe
Sep 2, 2003 10:35 AM
Chain stretch or Cassette wear???biknben
Sep 2, 2003 11:28 AM
How many miles do you have on this chain and cassette? The smaller rings of the cassette wear faster than the larger ones.

The grinding you feel could be because the chain isn't aligning up nicely with the teeth any more.
That's itKerry Irons
Sep 2, 2003 5:23 PM
Measure the chain for wear - if it's over 12 & 1/16 inches in a nominal 12 inch length (24 links) then you're looking at a new chain, and possibly a new cassette as well. Clean & lube everything first - if the noise/feeling persists then it's either the cassette or chain. You can't really measure the cassette for wear, so the chain will be your indicator.