Bottom Brackets
4 bottom brackets with verified specifications and live pricing. Each entry lists the shell standard, shell width and spindle recorded by the manufacturer, so you can check fitment before you buy.
| Component | Shell standard | Shell width | Spindle | From |
|---|---|---|---|---|
| Shimano BB-UN300 (Square Taper)Square taper cartridge BB, BSA threaded, 68mm, common spindle lengths | — | — | Square Taper | $18.00 |
| SRAM DUB BSA Bottom BracketThreaded BSA 68/73mm BB for DUB 28.99mm spindle cranks | English | 73 mm | SRAM DUB | $37.82 |
| Shimano BB-MT501 (BSA)Threaded BSA 68/73mm external bearing BB, 24mm Hollowtech II, alloy cups | English | 73 mm | Shimano Hollowtech II | — |
| Wheels Manufacturing BSA Bottom Bracket, Shimano MTB (24mm)Threaded BSA 68/73mm BB, ABEC-3 bearings, for 24mm Shimano Hollowtech II cranks | English | 73 mm | Shimano Hollowtech II | — |
Fitment values come from each component's recorded manufacturer specification. A dash means the value is not recorded for that part, not that it fits everything — check the individual component page.
Common questions
- How do I tell which bottom bracket standard my frame uses?Guide
- Do I need a 68mm or 73mm bottom bracket, and how do I measure it?It depends
- Will a SRAM DUB or Shimano Hollowtech II crankset fit a threaded BSA frame?Yes
- Can I fit a Hollowtech II crankset on a square-taper bottom bracket?No
- What tools do I need to remove a square-taper bottom bracket and crankset?Guide