Hope tech 3 v4 vented floating disc rotorthe v4 vented rotor is specifically for use with the hope tech v4 evo brake as it is slightly wider than the standard floating hope rotors this rotor will not fit into any other hope caliper in the range the v4 rotor effectively reduces the temperature of the disc by up to 15 and enables superior braking performance when the going really gets tough on steep alpine descents and on the worlds toughest downhill tracks the v4 rotor also gives exceptional bra