K-Force Light ABS BB386EVO road crankset features hollow carbon fiber arms for amazing stiffness and low weight. The adaptable BB386 EVO 30mm spindle will fit a wide variety of frames with a range of BB standards. The K-Force Light ABS BB386 EVO uses FSA's Asymmetric Bolt Standard, with four bolts. Choose from the traditional 53/39 chainring combination, 50/34 compact or 52/36 semi-compact. The unidirectional carbon finish, updated graphics and concealed chainring bolts make the K-Force Light look as fast as it is. Hollow carbon arms with UD carbon finish Forged AL7050 BB386EVO spindle Cold forged 100% CNC chainrings AL7075 Torx T-30 alloy chainring bolts Fits Shimano and SRAM 10-11 speed systems