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Old 10-09-15, 03:41 PM
  #20  
habilis
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Join Date: Apr 2015
Location: Morris County, NJ
Posts: 1,106

Bikes: 90's Bianchi Premio, Raleigh-framed fixed gear, Trek 3500, Centurion hybrid, Dunelt 3-spd, Trek 800

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If you suspect that one tooth is responsible for snagging the chain, mark that tooth with a dab of white paint and see if that's the one that always lifts the chain. If you suspect a particular chain link, mark that link with paint. If you KNOW it's one tooth, look for an abnormality in that tooth and take action on that tooth. That entails risk of permanent damage, as others have noted, so first be sure you don't have a damaged or stiff chain link.

If the chain is lifted by seemingly random teeth, it's probably not the cog or cassette.

Even though everything is relatively new, re-lubricate the chain. Your road conditions may have gummed it up, and a dry or dirty chain is prone to snagging. If the chain still snags, and it lifts on random teeth, check for a stiff link. Is there a pin that protrudes farther on one side than another? You can correct that with a chain tool and working the link by hand.

Have you eyeballed the derailleur and hanger from the rear and made certain neither is bent? The derailleur must be parallel to the plane of the wheel.
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