zipp-vuma-quad-ceramic-bearing-bottom-bracket-english-68mm
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zipp-vuma-quad-ceramic-bearing-bottom-bracket-english-68mm, Zipp Speed Weaponry Vuma Bottom Brackets are compatible with Zipp VumaQuad cranks only.Compatible with Zipp VumaQuad cranks onlyCeramic cups (gold cups) feature ABEC seven races and Grade two balls