Zipp 303 firecrest tubular road rear wheelthe zipp 303 tubular is perfection as far as road wheel design is concerned running on the 177 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 785g this wheel is light enough to climb up the steepest gradients and stiff enough to hammer down the trickiest descents features hub model177 rim outer width26 4m