Zipp's 30 Course wheelsets start with the versatile and durable 77D/177D hubset. Add in the 30 Course's durable, wide alloy rim which offers enhanced aerodynamic efficiency as well as better comfort, tire profiles, and cornering grip. The result is a wheelset full of Zipp's engineering prowess & function in a high-performance aluminum wheelset. Capable for disc-brake road, cyclocross, gravel adventures, training or racing.