Riders refreshing a bike with a 73 mm threaded shell and square-taper cranks that call for a 122.5 mm axle.
A threaded 73 mm cartridge bottom bracket with alloy cups, an aluminium sheath and a sealed bearing. Everything is contained in one unit, so there are no loose bearings to fit, and the waterproof seal helps keep the dirt out.
The axle is 122.5 mm of boron steel with square-taper ends. Match that length to what your square-taper crankset asks for, and make sure the frame's shell is 73 mm wide and threaded.
One sealed unit
The bearing and its waterproof seal are built into the cartridge.
Alloy cups
Alloy cups thread into a 73 mm shell.
122.5 mm axle
Boron steel, with square-taper ends and a 122.5 mm length.
Fit
Build
Great for
Maybe not for
Shell width 73 mm, threaded, square-taper axle, 122.5 mm long. Check the frame shell and the axle length your crankset specifies before you order.
Swapped, not rebuilt
A sealed cartridge is not adjusted or rebuilt. When it starts to feel rough or gritty, the whole unit is replaced.
