Zipp 303 firecrest tubular road wheelsetthe zipp 303 tubular is perfection as far as road wheel design is concerned running on the 77 and 177 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 1390g for the set this wheelset is light enough to climb up the steepest gradients and stiff enough to hammer down the trickiest descents features hub model77