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What's the size of ball bearing on WH-R550 hub, is it 1/4" for the front one and rear one ? Can I replace them with 1/4" ceramic bearing ?


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up vote 1 down vote accepted

According to Boca, they are 3/16" for the front and 1/4" for the rear. I see no reason why you can't run ceramic bearings in them.

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