The ITA - BB - XD15 Pro - 24mm from Enduro Bearings is an Italian Thread-In, Ceramic-Hybrid, XD-15, Angular Contact, Bearing Bottom Bracket. It is designed for Italian-threaded framesets and Shimano 24mm Cranksets, and also includes an adapter for SRAM GXP cranksets. Enduro Bearings proudly offers their top of the line BB bearing kit. This kit includes XD-15 Ceramic-Hybrid, ABEC-5 bearings, along with all necessary seals and spacers, ensuring a precise and professional installation. The XD-15 Ceramic-Hybrid bearings are an exclusive offering from Enduro Bearings. They feature corrosion-proof, cryogenically treated nitrogen steel races, combined with Silicon Nitride Grade 3 ceramic balls. This unique combination results in the ultimate high performance bearing setup. The deep-groove design raceways allow for maximum sized Grade 3 Silicon Nitride ceramic balls, which provide increased contact area and improved performance and longevity. The XD-15 bearings also feature 90% fill Kluber NBU52 grease, which runs better and smoother with time and is highly resistant to being washed out. This specialized grease is engineered to stick to the balls and continually be pulled back into the ball path where it is needed. One of the most impressive features of XD-15 bearings is that they only get better with use. As the bearings wear-in, the balls actually make the races even smoother. This means that compared to other ceramic-hybrid bearings on the market, which may claim speed and power advantages on day one, the Enduro XD-15 bearings provide the same initial advantages and will continue to get faster and smoother over time and use. To demonstrate their confidence in the quality and durability of their product, Enduro Bearings offers an unlimited lifetime bearing and race warranty. Shell Fitment: ITA Bearings: XD-15 Ceramic Seal Type: LLB Grease: Kluber NBU52 Grease Axle Size: 24mm Warranty: Unlimited Lifetime Enduro Reference Number: BKC-0811