Zipp: OVERVIEWZipp’s 404 Firecrest Tubeless Disc brake is a pro-proven Speed Weapon for any situation. The 404’s heritage as Zipp’s icon of speed extends back decades, and its future is even brighter. At 58mm deep, the 404 Firecrest Tubeless is ideal for road races, time trial and triathlon, gran fondos, and riding over varied terrain. The wheelset’s 23mm internal width is perfect for running wider tubeless tires at reduced air pressure. That is a vital component of Total System Efficiency™, or TSE™, an approach to speed on ever-changing roads and riding conditions. Specifically, TSE™ focuses on overcoming specific barriers to speed: wind resistance, gravity, rolling resistance, and vibration losses. Zipp’s ABLC™ Sawtooth™ Technology uses an intricate dimpling pattern to improve aero efficiency. Zipp’s use of hookless (straight side) rims in the 404 Firecrest is integral to Making You Faster. With hookless, the transition between the tire and the rim is more seamless and aero. Zipp’s hookless rims have more efficient resin distribution, which means lighter, stronger wheels. At the center of the 404 Firecrest Tubeless Disc-brake is a versatile and durable new hubset, the German-engineered ZR1 DB. If you had to choose just one wheel for road riding and racing, the 404 Firecrest Tubeless Disc brake is a savvy and speedy choice.FEATURESVersatile aero wheelset for the modern road bike with tubeless and hookless rim profileOptimized tire bed for easy tire installationWide 23mm rim profile creates a better tire interface to be fast on or off the roadNew ZR1 DB hub is engineered in Germany with better seal design for improved durability and quicker response with 66 points of engagementShips with 12mm front and rear end capsCenter locking rotor interface. Lockring is included with the wheelsXDR™ or SRAM/Shimano driver bodiesCampagnolo driver body sold separatelyLifetime warranty SPECIFICATIONSOrientation (wheels): RearSize (wheels): 700cRim construction: Carbon – HooklessTire compatibility: Tubeless tires onlyRim depth: 58mmSurface texture: ABLC SawToothBrake compatibility: Disc (Center Lock)Rim - inside width: 23mmRim profile: SymmetricalRim finish: UD fiber, adhesive decalsColor (Decal): StandardNipple material: AluminumNipple anti-rotation: Sapim Secure-LocSpoke type: CX-Ray - BlackSpoke count: 24Spoke pattern: 2 CrossHub: ZR1 Disc BrakeDriver body type: SRAM/Shimano RoadColor (hub): BlackAxle type (Wheels): TA 12x142Axle material: Aluminum front & rearBearings: Cartridge - SteelDriver Mechanism: 6 Pawls Leaf Spring, 66 POEDriver body material: AluminumMax tire pressure: 73psiMax recommended rider weight: 250lbsSpoke Length DS: 248mmSpoke Length NDS: 252mmMax outside width: 28mmPart Weight (g): 981