Enduro Bearings presents the BSA - Bearing Kit - XD15 Ceramic - 24mm. This top-of-the-line bottom bracket bearing kit is specifically designed for Shimano 24mm x 37mm External Cup BBs. Our XD-15 Ceramic-Hybrid, ABEC-5 bearings are paired with necessary seals and spacers for a precise and professional installation.What sets our XD-15 Ceramic-Hybrid bearings apart is our exclusive proprietary process that combines corrosion-proof, cryogenically treated nitrogen steel races with Silicon Nitride Grade 3 ceramic balls. This results in the ultimate high-performance bearing setup. The deep-groove design raceways allow for maximum sized Grade 3 Silicon Nitride ceramic balls, increasing contact area and improving performance and longevity.Our XD-15 bearings are filled with 90% fill Kluber NBU52 grease, designed to run better and smoother with time. This grease is highly resistant to being washed out and sticks to the balls, continuously being pulled back into the ball path where it is needed. Unlike other bearings, XD-15 bearings actually get better with use. As the bearings wear-in, the balls make the races even smoother, resulting in even faster and smoother performance over time.We are so confident in the quality of our XD-15 bearings that we offer an unlimited lifetime bearing and race warranty. For easy removal and installation, we recommend using the BRT-003 (eb9040) 24mm x 37mm bearing tool.Shell Fitment: BSABearings: XD-15 CeramicSeal Type: LLBGrease: Kluber NBU52 GreaseAxle Size: 24mmWarranty: Unlimited LifetimeEnduro Reference Number: BKS-54103