Zipp 404 Firecrest Tubeless wheels are a proven speed weapon for any situation. With a depth of 58mm, the wheels are ideal for road racing, time trials and triathlons, granfondos and riding on varied terrain. The 23mm internal width of the wheels is perfect for running wider, lower-pressure tubeless tires. This is a vital component of Total System Efficiency™ (TSE™), an approach to speed on ever-changing roads and driving conditions. In particular, 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 aerodynamic efficiency. With hookless, the transition between the tire and the rim is smoother and more aerodynamic. Zipp's hookless rims have more efficient resin distribution, meaning lighter, stronger wheels. At the heart of the 404 Firecrest Tubeless is a new versatile and durable hub, engineered in Germany with an improved sealing design for increased durability and quicker response with 66 points of engagement.