I'm converting a Hollowgram SL crank to fit a standard frame so I need BB cups. Are all Zipp Vuma bearings 30mm? I see them listed as Vuma and Vuma Quad so I don't know if there is any difference. I found BB cups listed as Vuma for way less $ so hopefully they are 30mm. For the ceramics I see prices ranging from $110 to $360 or for steel bearings $36.70 to $110. That is a huge difference in price!
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Thread: Zipp Vuma bearing question