Wheels Manufacturing BB30 to Outboard Bottom Bracket with SRAM Compatible for AC Bearings, Red Angular Contact bearings. USA Machined shell is superior in function and durability to plastic Will accept current 22-24mm (SRAM, Truvativ GXP) 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