Good
ProJockey wheels on the cyclocross bike were badly worn. Decided to replace them with some Tacx sealed bearing pulleys since they needed replacement anyway (no, not ceramic!). The difference is astounding! Suddenly the drivetrain is silent! Just going from cheap bushings to bearings makes all the difference. No need to spend $150 for ceramic - just get some $15 pulleys and you have 99% of the benefit.
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