| 摘要 |
A bicycle bottom bracket assembly has a crank axle and a pair of bearing units coupled thereto. The bearing units are configured to be mounted in a tubular hanger part or bottom bracket tube of a bicycle frame. The crank axle has a central portion, a first axial end portion disposed on a first side of the central portion and a second axial end portion disposed on a second side of the central portion. Each of the bearing units has an outer race, an inner race and a plurality of rolling members between the first outer and inner race. At least one of the bearing units has at least one drainage passage formed in the outer race.
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