Never count out the 404, Zipp"s most popular wheel has carried cyclists and triathletes to victory from the Alps to Kona, and it just keeps getting faster. Features: Zipp Campy wheels require an internal spacer to be installed in order for them to be compatible with Campagnolo 11 speed cassettes Best terrain: all-around, mountains, sprints, track, time trials, triathlons Zipp Campy wheels require an internal spacer to be installed in order for them to be compatible with Campagnolo 11 speed cassettes QR"s not included