Zipp 303 clincher disc road wheelsetthe zipp 303 clincher is perfection as far as road wheel design is concerned running on the 77d and 177d model hubs and the firecrest rim this wheel build offers improved stiffness durability versatility and simplicity to maintain whether it is on the road or during a cyclocross event at just 1645g for the set these wheels are light enough to climb up the steepest gradients and stiff enough to hammer down the trickiest descents features hub model77d