Shimano Dura Ace Bottom Bracket BB92 PF86.5mmDURA ACE Bottom Bracket Press Fit HOLLOWTECH II 86. 5 mm shell width With an advanced seal construction for smoother rotation, the DURA ACE is still lightweight at 54 grams. Bottom bracket with small ball bearings for lightweight Advanced seal construction for smoother rotation Weight: 65g (SM BB9000) 54g (SM BB92 41B)
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