The 303 nsw is no race day only wheelset to be tucked away in a wheel bag until a race number is pinned to the riders jersey its built to take the abuse of everyday training rides zipp has achieved this reliability at a lighter weight with a revised carbon fiber layup developed through testing on the famed cobbles of the arenberg forest with the worlds fastest riders hubs with the cognition hubsets axial clutch technology weve reduced this drag by disengaging the ratchet mechanism