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ROAD公路 OUNCE-521C-N
CRANK   LENGTH曲柄长度170 / 172.5 /   175MM 
CHAINRING齿片50-34T
BB SETSBB 组PW-BB68+ / PW-BB86
CRANK MATERIAL曲柄材质FORGED   AL-6061-T6
CRANK FINISH曲柄涂层BLACK SAND ANO.
COMPATIBILITY变速兼容11S / 10S / 9S 
B.C.D螺丝分布直径110MM
CHAINLINE链条中心线43.5MM 
CHAINRING   MATERIAL齿片材质ALLOY(50T) /   STEEL(34T)
CHAINRING   FINISH齿片涂层BLACK SAND ANO.
Q-FACTOR /   I-FACTOR曲柄后下叉距离 158 / 131MM

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