The thread solution developed by Nova Ride concerning Press Fit Bottom Brackets makes it possible to perfectly align the two cups, causing cracks to disappear and improve the durability and fluidity of the bearings. This thread solution facilitates the bottom bracket assembly and maintenance, and makes it especially possible to raise the bottom bracket stiffness by attaching the two cups together. Made from very high-quality materials: two CNC-Anodized 7075 aluminum cups for better stiffness and coupled to ceramic ball bearings that reduce the friction on the crank and improve the transmission of the drive. To mount the Bottom Bracket you need a special tool to secure your bottom bracket during installation. Click here to order it. Compatibility A - Frame width: 68/73mm B - Internal scale diameter: 46mm C - Diameter Crankset: 24/29/30mm PF30 - Pressfit30 24mm Shimano Crank sets. 29mm Sram Dub Crankstellen. 30mm Praxis / FSA / Rotor / Cane Creek Crankets.