Zipp 404 Firecrest Carbon Rear Wheel - 700 12 x 142mm Center-Lock XDR Tubeless Black A1. Zipp 404 Firecrest wheels are better than ever now featuring a Tubeless ready design that allows for reduced tire pressures and lower rolling resistance combined with increased cornering grip and compliance without the risk of pinch flats. The 58mm rim depth is a classic size that has carried athletes to victory in every kind of event and situation – triathlon distance breakaways field sprints and hilly finishes. Zipp’s ABLC Sawtooth Technology uses a complex dimpling pattern to improve aero efficiency combined with a versatile and durable new hub the German engineered ZR1. If you had to choose just one wheel for road riding and racing the 404 Firecrest Tubeless is a savvy and speedy choice.