FSA Rotors. Features: K-Force rotors feature a two piece design balancing weight and braking performance. Weight relieved alloy carrier for added rotor stiffness. 98g Afterburner rotors have an increased surface area for better heat management. 142g Rotors include: (1) 6-bolt/44mmBCD rotor with (6) T-25 rotor mounting bolts Specs: Model:K-Force Description:2-piece rotor Mount:6-bolt Size:160mm