Okso you have bb30 pf30 or a specialized osbb frame but you need to run a shimano crankno worries our praxis works conversion bb is just what youre looking for made to fit in either bb30 or pf30 frame the conversion bb is designed to be rock solid for a shimano hollowtech ii crank to be installed in your framedesigned for shimanot 24mm hollowtech ii cranks some race facet and fsat 24mm spindle cranks work also