Jockey wheel grabbing chain..
05-09-10, 11:02 PM
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Jockey wheel grabbing chain..
On my rear derailler the upper jockey wheel has begun "grabbing" the chain- for a split second- thereby causing an annoying clicking sound. It's almost as if the one tooth (the same one)on the wheel is sticky, or dirty and causing the chain to remain on the wheel a fraction longer and then clicking as it leaves the tooth. Any suggestions/recommendations?
05-10-10, 07:28 AM
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Inspect the pulley to be sure there are no burrs or nicks. If you find any, file or sand them smooth.
Also, it could be a tight link in the chain. Turn the cranks backwards slowly and watch the chain as it comes off of the pulleys. A tight link will be apparent.
Also, it could be a tight link in the chain. Turn the cranks backwards slowly and watch the chain as it comes off of the pulleys. A tight link will be apparent.
05-10-10, 08:09 AM
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I suspect it's the chain more than the pulley, mainly because the pulley spins so fast that you rapid clicking more like the ticking of a watch. Do the stiff link test Hillrider suggested but to make it more sensitive hold the idler cage to take all the tension out of the chain and let it droop a bit as you backpedal. Without any tension at all except the weight of the chain, stiff links become more obvious.
Also look for a twisted link, which might have been the result of a bad shift.
Also look for a twisted link, which might have been the result of a bad shift.
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Chain-L site
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Just because I'm tired of arguing, doesn't mean you're right.
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FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
05-11-10, 12:13 AM
#4
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I would give the drivetrain a good, thorough degreasing, including the whole chain and both jockey wheels (remove them for the rear derailleur to do it well, should only need a 3mm allen key), then re-lube and see whether the problem persists. This should hopefully catch all the possible causes mentioned above, and will help to make everything run more smoothly, not just the point where the problem was most apparent. If problems still exist then try the methods above to hunt the source down more precisely.
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