Zipp’s 303 Firecrest Tubeless rim-brake wheelset is an all-around wheelset for a new era of road riding. It’s rich in heritage yet loaded with innovations. It’s as adept in the mountains as it is on rolling hills windswept farm lanes or ferocious field sprints. At Zipp we never rest on laurels. This wheelset features a 19mm internal width and is tubeless ready. That means you can run lower tire pressure for greater cornering grip and compliance with reduced rolling resistance without the risk the pinch flats. When it comes to pure speed the 303 Firecrest Tubeless packs a serious punch. It’s lightweight with ABLC™ Sawtooth™ Technology a complex dimpling pattern first developed for our top-level NSW wheel lineup. This technology helps to achieve the optimization of low aerodynamic drag and crosswind stability which we call AeroBalance™. Zipp’s ShowStopper™ textured braking surface delivers unrivaled rim braking performance in wet or dry conditions. At the center of the 303 Firecrest Tubeless rim-brake is a new versatile and durable hubset the German-engineered ZR1. FEATURES Zipp graphics and cosmetic identity that scream speed New ZR1 hub is engineered in Germany with better seal design for improved durability and quicker response with 66 points of engagement Built with Sapim CX Sprint J-bend spokes Tubeless ensuring secure performance even when ridden at lower tire pressures Versatile 45mm rim profile that’s fast stable and versatile ABLC Sawtooth™ dimple design helps manage air flow around the rim and contributes to create a faster more stable wheel Showstopper™ textured brake track delivers superior modulation and shortest stopping distances in wet and dry conditions XDR™ or SRAM/Shimano driver bodies Ships with QR end caps quick release skewers Campagnolo driver body sold separately SPECIFICATIONS SIZE WHEELS 700c RIM CONSTRUCTION Carbon - w/Hooks TIRE COMPATIBILITY Tube-type or Tubeless tires BRAKE COMPATIBILITY Rim DRIVER BODY TYPE n/a SRAM XDR SRAM/Shimano Road RIM - INSIDE WIDTH 19mm RIM FINISH UD fiber adhesive decals RIM PROFILE Symmetrical SPOKE LENGTH DS 254mm 260mm SPOKE LENGTH NDS 254mm 264mm WEIGHT G 1530 WEIGHT BASED ON Lightest configuration: Quick Release axles and XDR body. No tape or valve included in weight. Front: 688g Rear: 842g