The Hope V4 Vented Discs have been redesigned with wider braking surfaces making them suitable as a replacement in many breaking systems, as well as Hope's own.  Hope V4 Vented Disc Features The vented rotor is designed specifically for Hope's Tech V series brakes The rotor uses internal fins to allow the air to flow between the two friction parts The induced air flow significantly reduces heat build up in the rotor Fantastic and consistent braking performance in wet conditions - all thanks to its capability to clear the water layer through its fins Dyno tests have shown up to 15% less heat build up compared to Hope's floating rotors Weight - 203mm - 288g