Features all the advantages of the BB30 system: lighter, stiffer and more durable. Requires a BB30 specific bottom bracket shell/frame . Bladder molded hollow carbon monocoque arm/spider with 30mm aluminum spindle fixed into drive arm. BB30 Ceramic bottom bracket included which features FSA Ceramic cartridge bearings with smoother, lighter balls . 39/53t CNC 7075 Shimano, SRAM, Campagnolo Ultra Narrow compatible 10 speed rings with ramps/pins . Includes 7075 aluminum Torx T-30 chainring bolts. 670g (w/ rings & BB). Updated red and white K-Force graphics. Features: BB30 Shells are 42mm I.D. and have no threads BB30 Road cranks only work with 68mm wide BB30 shells Shimano, SRAM and Campagnolo Ultra Narrow 10-Speed compatible Monocoque carbon crankset with hollow arm design AL7075 CNC Machined Super Chainrings Only Fits BB30 Shells