Shimano BB-UN300 Square Spindle Bottom BracketsFits JIS square-taper cranksets Crankarm fixing bolts sold separately Hollow spindle
| Bottom Bracket Shell I.D. | 1.37 |
| BB/Frame Interface | English |
| BB Shell Width (mm) | 73 |
| Spindle Interface Type | Square Taper JIS |
| Spindle Length | 113 |
| Defined Color | Black |
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