Rolling deepThe PF30 bottom bracket uses reliable 6806 retainer bearings packed with waterproof grease along with wiper seals to keep the gunk out.Close Enough Won't Cut ItWe fired up the ol' CNC machine to make sure the anodized 30mm alloy cups of this bottom bracket provide an exact, perfect quiet fit for your frame.Weather, Or NotAll RF bottom brackets come with an inner plastic sleeve to keep the elements out and the appropriate spacers to ensure a perfect fit.Rock The BBPrecise fit, smooth-rolling operation, long-living performance–what more can you ask for from a bottom bracket? Install a 30mm CINCH crankset friendly PF30 and get riding...and keep riding.Specs BB Diameter (MM) 46 Bearing Style Single Row Color Black Shell Standard Press Fit 30 Spindle Diameter (MM) 30 Weight 106g Weight Conditions PF30 73mm