General description Zipp’s 404 Firecrest Tubeless Disc brake is a pro-proven Speed Weapon for any situation. With a heritage as Zipp’s icon of speed, the 404 Firecrest is designed for road races, time trials, triathlons, gran fondos, and varied terrain. Its 58mm depth and 23mm internal width make it ideal for running wider tubeless tires at reduced air pressure, enhancing Total System Efficiency™ (TSE™) by addressing wind resistance, gravity, rolling resistance, and vibration losses. The wheelset features Zipp’s ABLC™ Sawtooth™ Technology for improved aerodynamic efficiency and utilizes hookless rims for a seamless tire transition, resulting in lighter and stronger wheels. The versatile and durable German-engineered ZR1 DB hubset ensures quick response and improved durability. Technical specifications Rim construction: Carbon – Hookless Tire compatibility: Tubeless tires only Rim depth: 58mm Rim inside width: 23mm Rim profile: Symmetrical Surface texture: ABLC SawTooth Brake