FEATURES
- 8/7/6-speed
- Crank arm lengths: 170mm
- Chainline: 47.5mm
- Chain guard option available
- Chainring combinations: 42-34-24T, 48-38-28T
PRODUCT SPECIFICATIONS
| MODEL NO | FC-M131 |
|---|---|
| SERIES | SHIMANO |
| Color | Series color |
| Remarks | SHIMANO logo |
| Spider/gear arms | 4 |
|---|---|
| Chainring combination | 48 |
| Q-factor (mm) | 1805 |
| Crank arm length (mm)|170 | ✔ |
| Optional chain guard|With chain guard | ✔ |
| Optional chain guard|Without chain/bash guard | ✔ |
| Compatible bottom bracket type|Square | ✔ |
| Recommended bottom bracket|Threaded (normal) | BB-UN100 |
| Recommended bottom bracket|Threaded (chain case) | BB-UN100-K |
| Axle length of BB-UN/ES (mm)|Threaded (normal) | D-NL |
| Axle length of BB-UN/ES (mm)|Threaded (chain case) | D-NL K |
| Threaded bottom bracket shell width (mm)|68 | ✔ |
| Threaded bottom bracket shell width (mm)|73 | ✔ |
| Chain case compatible | ✔ |