齒盤 RA3-721C

RA3-721C

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