The 303 firecrest tubular disc brake wheelset pro proven in cyclocross is now even better and lighter at the centre of the wheelset is zipps 77177d hubset an innovation that results in improved stiffness durability simplicity and usability the 77177d hubset is the perfect compliment for the leading aerodynamics ride quality stability and rim strength of zipps firecrest rim technology that means you get the unmatched performance of the 45mm deep 303 firecrest rim proven with victor