Bottom Brackets
The bottom bracket allows the crank spindle to rotate in the frame. It is separate from crank arms; frame shell and crank interface both matter. Explore cartridge units alongside service parts such as balls and seals.
Bottom Brackets collection
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Shimano Bicycle Center Hub SM-BBR60 BSA Hollowtech II
ShimanoSM-BB94-41A XTR Bicycle Hollowtech II Mid Hub Press Fit 89.5/92mm ISMBB9441A
Shimano Dur-Ace SM-BB92-41B BB86.5mm Mid Bearing
Shimano Dura Ace BB-R9100 Bottom Bracket 68mm Hollowtech II
Neco Ball Middle Bearing B887 Cp
Sram Dub T47 85.5 Road Center Bearing Set
Shimano BB-MT500-PA Press Fit Mid Hub 89.5-92mm 21V53000057
Shimano Bottom Bracket SM-BB52 Hollowtech II ESMBB52D 83mm
Shimano BB-RS501 Hollowtech II Bottom Bracket 68mm BSA EBBRS501B
Sram Gxp Medium Bearing Bb-Gxp Bsa
Shimano BB-ES300 Octalink Bottom Bracket 118/73mm BSA EBBES300C18
Shimano SM-BB71-41B Hollowtech II Press Fit Bottom Bracket ISMBB7141B
Sram Dub BB386 Road Orta Yatak
Sram Dub PF30 Mtb Road 73 Press Fit Orta Yatak
Sram Dub BB30 Road 73-A Press Fit Orta Yatak
Match frame shell and crank interface
Identify shell width and interface standard first. Thread standard matters for threaded systems, seat dimensions for press-fit systems. Crank spindle design must suit the bottom bracket. For square-taper cartridges, check spindle length against system requirements; changes can alter crank position. Do not choose by bicycle type alone. For balls or seals, check the exact component model and service code before complete bottom bracket dimensions.
- Record frame and crank models together.
- Distinguish shell width from spindle length.
- Assess complete bottom brackets, caged balls and seals separately.
Is a bottom bracket a crankset?
No. It is the bearing assembly; crank arms and chainrings form a separate crankset group.
Are all bottom brackets of equal length compatible?
Length alone is insufficient. Frame interface, shell width and crank spindle standard must also match. Compare manufacturer dimensions.
