The Praxis M30 Bottom Bracket 68/73mm. The M30 bottom bracket allows us to use one spindle for three of the most common bottom bracket frame standards in the market. The M30 bottom bracket is available as English threaded frames, BB86/BB92, or in the very popular Praxis Conversion for BB30 or PF30 frames. This design keeps the cartridge bearings outboard the frame free of frame tolerance issues and keeps the bearings aligned for longer wear and noise free riding. One crank, with proper bottom brackets’s for compatibility across many frame types. Praxis M30 Bottom Bracket 68/73mm Features   For M30 spindle based cranks only. For install in English Threaded/BSA frame Forged & machined heat-treated 7075 T6 AL cups Steel cartridge bearings 68mm Road version / Cup spacers for 73mm MTB setup Use M30 BB tool for installation