SLR PF30-386 PF30轉BB386 陶瓷啤零BB

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兼容性: 安裝 BB386evo 大餅於 PF30 frame. 規格: Grade 3 Si3N4 陶瓷珠啤零 車架BB規格 PF30 車架BB闊度 68mm 車架BB直徑 46mm 大餅軸心直徑 30mm 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