Altus M371 Series 
Optimised for Shimano Hyperglide chains 
Smooth drive train transmission 
Enhanced shifting 
Includes black chain guard
Specifications
- 3x9 speed 
- Crank arm length: 170mm 
- Chain ring combination: 48/36/26T 
- Chain line: 50mm 
- Compatible chain: HG 9-speed 
- Crank fixing bolt included: Yes 
- Recommended BB: BB-UN300 (threaded) 
- Q-factor: 180.5mm