SLR BB86-DUB 陶瓷啤零BB

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兼容性: 安裝 Sram DUB 大餅於 BB86 frame. 規格: Grade 3 Si3N4 陶瓷珠啤零 車架BB規格 BB86 車架BB闊度 86mm 車架BB直徑 41mm 大餅軸心直徑 27mm Grade 3 陶瓷珠 Balls are rated by their grade. A Grade 3 ball means that the b all is 3/1,000,000” tolerance of sphericity, and so is extremely round. In fact, the races of any bearing can't come close to this level of precision in their trueness, but every component being closer to perfect helps decrease friction. Another feature of Grade 3 is surface finish, which in this case is free of scratches or scuffs, and to a Show more