曲柄: 170,172.5,175mm (Forged AL6061-T6) 齒盤: 39/53T (AL-7075.CNC) 中軸: Taper Square 113mm/M8 鍊線: 43.5mm BCD: 130mm 變速: 2x9s/2x10s
曲柄set RA3-721C