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Promax EX-1 Alloy external Sealed Bottom Bracket 68/73mm Black. EX-1 External bottom brackets feature cold-forged and CNC-machined alloy cups dual-labyrinth bearing covers and precision sealed bearings. They are the perfect match to Promax CF-2 and HF-2 cranks and ultimate upgrade to the budget BBs sold with most crank sets.Fits all 24-millimeter bottom bracket spindles and frames with 68 or 73 x BC1.37” bottom bracket shells
- TECH SPECS
| Bottom Bracket Shell I.D. | 1.37 |
| BB/Frame Interface | English |
| BB Shell Width (mm) | 68 |
| BB Shell Width (mm) | 73 |
| Weight | 102.9 |
| Spindle Interface Type | Shimano Hollowtech II |
| Spindle Interface Type | FSA MegaExo |
| Spindle Interface Type | FSA MegaExo Light |
| Spindle Interface Type | RaceFace EXI |
| Defined Color | Black |
