This BB uses 6806 retainer bearings packed with waterproof grease along with wiper seals to ensure above-and-beyond durability and performance.- Death to Creaks:We fired up the ol´ CNC machine to make sure the anodized alloy cups of this bottom bracket provide an exact, perfectly quiet fit in your frame.- Weather, Or Not:All RF bottom brackets come with an inner plastic sleeve to keep the elements out and come with appropriate spacers to ensure a perfect fit.Bottom brackets are something you never think about until you do. Every click or grind you hear coming from down there can slowly drive you insane. Get yourself a quality BB and save your sanity - our 30mm BB92 stands for precision and durability.Specifications:- Shell Standard:Press Fit- Bearing Style Single Row- BB Diameter (MM):41- Spindle Diameter (MM):30- Weight:69g- Weight Conditions:BB92