Zipp 303 firecrest clincher road rear wheelthe zipp 303 clincher is perfection as far as road wheel design is concerned running on the 77 model hub 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 900g this wheel is light enough to climb up the steepest gradients and stiff enough to hammer down the trickiest descents features hub model 177rim outer width 26 4m