HOPE PART BRAKE V4 VENTED DISC-220MM-6 BOLT-SILVER"The vented disc is designed specifically for our Tech V series brakes. The disc 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 disc. Fantastic and consistent braking performance in wet Designed specifically for our V4 brakes. The Vented disc is highest performing disc for the harshest operating conditions. The outer is constructed from three pieces to create