TruVativ HammerSchmidt Bottom Brackets are only compatible with HammerSchmidt cranks.All-Mountain uses an M15 crank bolt68/73mm models provide 50mm chainlineRequired bottom bracket for HammerSchmidt cranksetsSealed cartridge bearingsFreeride spindle uses an M12 crank bolt, All-Mountain uses an M15 crank bolt68/73mm models provide 50mm chainline, 83mm models provide 56mm chainlineItem SpecificationsWeight295gBB Thread TypeEnglishSpindle Interface TypeTruVativ HammerSchmidtBB Shell Width68,73mmDefined ColorSilver