Bearings, Bearings, Bearings Bottom Brackets can make a huge difference so Race Face have made sure their double row custom retainer bearings are super durable and up for the long run. Only Precise is Quiet CNC machined and anodized alloy cups of this CINCH compatible BB provides an exact, perfectly quiet fit in your frame, far superior to moulded plastic cups. All Weathers All RF bottom brackets come with an inner plastic sleeve to keep the elements out and included are all appropriate spacers to ensure a versatile fit. Clydesdale of Bottom Brackets This trusty 30mm workhorse of a bottom bracket is built with custom RF double row cartridge bearings for trouble- free, long haul rolling for your BB92 press fit frame.