Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
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 ?
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.
Required, but never shown