ISIS Bottom Brackets

ISIS bottom brackets use a 10-spline spindle that fits ISIS cranks and grips them strongly and evenly, with little flex. The bearings are housed in cups that thread into a standard Euro (BSA) BB shell, so they’re easy to install and service. You’ll mostly see them on race bikes, older BMX setups and some cruiser builds, where they give a solid connection between your cranks and frame.

They only fit ISIS-spline cranks with a Euro threaded shell, so check your frame and cranks before ordering.