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Old 04-13-12, 11:32 PM   #26
neurocop
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Join Date: Oct 2011
Location: SF Bay Area
Bikes: 2003 Lemond Zurich; 1987 Schwinn Tempo; 1968 PX10; 1978 PX10LE, Peugeot Course; A-D Vent Noir
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Quote:
Originally Posted by gearbasher View Post
I was thinking of just filling in the crack with epoxy or JB Marine weld and not trying to actually close the crack. Has anyone tried that?
Been there and done that for cracks in Simplex and Campy jockey wheels (filled in the crack with JB Weld after cleaning the pulleys in an ultrasonic bath and anhydrous alcohol to remove all traces of oil). None of these repairs have ever failed...but I'm not sure that the wheels would have split more if I hadn't done the "repair." I think most of these splits are do to some sort of oxidative brittleness and shrinkage of the plastic wheels. Theoretically the split could widen the wheel tooth spacing, but these cracks have been narrow (<1mm) and really have no effect on chain link engagement in my experience.
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