In A Sea Of Bearings These little buggers can make a huge difference so we\'ve made sure our double row custom retainer bearings are super durable and up for the long run. Close Enough Won\'t Cut It CNC\'d machined and anodized alloy cups of this CINCH compatible BB provide an exact, perfectly quiet fit in your frame - far superior to molded plastic cups. Weather, Or Not All RF bottom brackets come with an inner plastic sleeve to keep the elements out and include all appropriate spacers to ensure a versatile fit. As The Wheel Turns This trusty 30mm workhorse of a bottom bracket is built with custom RF double row cartridge bearings for trouble- free, long haul rolling for you BB92 press fit frame.