- Shimano BB-UN300 quare Spindle Bottom Brackets
- Fits JIS square-taper cranksets
- Crankarm fixing bolts sold separately
- Hollow spindle
- Spindle Interface Type: Square Taper JIS
- BB Shell Width (mm): 68 or 73
- Bottom Bracket Shell I.D.: 1.37
- Spindle Length:
- (68) 107, 110, 113, 115, 117.5, 118, 123
- (73) 113
- BB/Frame Interface: English
- Defined Color: Black
- Published Weight:
- 256g (68x107)
- 262g (68x110)
- 270g (68x113)
- 272g (68x115)
- 275g (68x117.5)
- 276g (68x118)
- 281g (68x123)
- 278g (73x113)