曲柄: 170mm (Forged AL6061-T6) 齒盤: 24/32T(Steel),42T(Alloy) 中軸:Cups-BC-1.37x24/68mm/73mm 鍊線: 50mm BCD: 64/104mm Speed: 3x10s Weight: 890g
曲柄set MA9-531C-NT