30 course disc brake rear clincher zipps 30 course disc brake clincher aluminum wheelset is as packed full of innovations as your best day on a bike was packed with euphoria the 30 course disc brake clinchers durable wide rim profile offers enhanced aerodynamic efficiency as well as better comfort and cornering grip this is a high performance aluminum wheelset engineered to provide versatility for the new era of road cycling that includes disc brake road applications but also cyclocross and