Round Plate Aero Rotor NoQ Exterior BlackRound plate made of 7075 T6 aluminum by CNC.Aero design: greater rigidity and aerodynamics with a spectacular aesthetic.Shift pins in steel.Compatible with groups of 9, 10 and 11v.Available in different BCD and serrated. Round Plate Aero Rotor NoQ Exterior BlackRound plate made of 7075 T6 aluminum by CNC.Aero design: greater rigidity and aerodynamics with a spectacular aesthetic.Shift pins in steel.Compatible with groups of 9, 10 and 11v.Some cranks require specific chainrings.Available in different BCD and serrated.