The Promax external bottom bracket suits the Promax CF-2 and HF-2 BMX racing cranks perfectly, as well as many other race cranks that make use of a 24mm spindle.

• Fits all 24-millimeter bottom bracket spindles and frames with 68 or 73 x BC1.37" bottom bracket shells
• CNC machined alloy cups
• Dual-labyrinth bearing covers
• Precision sealed bearings
• Spindle Interface Type: Shimano Hollowtech II , FSA MegaExo , FSA MegaExo Light , RaceFace EXI
• Bottom Bracket Shell I.D.: 1.37
• BB Shell Width (mm): 68 , 73
• BB/Frame Interface: English
• Weight: 102.9g