SwissStop Catalyst disc rotors deliver consistent brake torque over long durations where others experience gradual decline and brake fade. 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. One piece rotor featuring the tested and proven Catalyst brake ring 6-bolt mount 1.95 mm thickness Can be used with adapter for Centerlock hubs 140 and 160 mm are UCI approved