Wheels Manufacturing PF30 to Outboard Bottom Bracket with Shimano Compatible for AC Bearings, Red Angular Contact bearings. USA Machined shell is superior in function and durability to plastic Will accept current 24mm (Shimano, FSA, Race Face, etc.) cranks Enduro ABEC 3 sealed bearings. Dual silicone seal keeps the contamination out for longer life. Serviceable bearings Threaded design eliminates creaking Made in the USA