Converts non-threaded 46mm press-fit BB shells to accept most 24mm (Shimano type) spindle cranks without the need for adapters Enduro ABEC 5 Angular Contact sealed bearing in drive side cup Enduro ABEC 3 sealed bearing in non-drive side cup Dual silicone seal keeps the contamination out 68/73mm PF30 Shimano HTII 24mm Alloy 153g Black