WM-CB-R40S
- Chainring: 53/39T, 50/34T, 50/32T, 48/32T, 46/34T, 46/30T. Teeth 7075/T6 CNC
- Crank: Hollow carbon
- Length: 170, 172.5, 175mm
- Speeds: 9~11s
- BB-Axle: Ouside Bearing PF 30 386
SHUN SHING INDUSTRY CO., LTD.
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