曲柄: 170,172.5,175mm (Forged AL6061-T6 ) 齒盤: 39/53T (39T Steel,53T Alloy) 中軸:Taper Square 113mm/M8 鍊線: 43.5mm BCD: 130mm Speed: 2x9s/2x10s
曲柄set RA3-522C