SwissStop Catalyst disc rotors deliver consistent brake torque over long durations where others experience gradual decline and brake fade. Optimum heat dissipation for maximum braking endurance and shortest stopping distances. Reliable performance from cyclocross to downhill with high durability, even in the toughest conditions. Lightweight 7075-T6 aluminium spider with highly efficient SUS410 stainless steel brake track. UCI approved for use in road competition. Centrelock fitment. Due to extremely efficient thermal management, Catalyst provides notably shorter stopping distances with very low wear rates under hard braking, exceeding the current industry leaders. Optimum heat dissipation for maximum braking endurance. High Durability, even in the toughest conditions. Lightweight alloy spider and stainless steel brake track. UCI approved for road competition. Centrelock fitting, 156g (Lockring not included).