Since its inception, the 58mm deep Zipp 404 wheelset has always been about speed. Bikes have evolved, and wheels needed to accommodate the evolution as well which is how we've arrived at the tubeless 404 Firecrest Carbon Disc Brake Road Wheelset. Here, aerodynamics are still the name of the game, but with newer drop bar bikes sporting disc brakes and with the increased performance benefits of tubeless tires, Zipp needed to tweak the venerable 404 to get the most out of these modern bikes. These new disc brake 404's stop on a dime and the ability to run lower tire pressure without the fear of a pinch flat, they'll roll faster, more comfortably, and are less likely to puncture.Of course, the wheels are still aero-first (hence the insistence on "slightly" above), and ditching the rim brake track means that the aerodynamic benefits of Zipp's Aerodynamic Boundary Layer Control (ABLC) dimpling can extend all the way to the edge of the rim. While we can't guarantee anything, extending ABLC might logically be credited with reducing the additional drag caused by disc brakes--though, to be fair, we've seen estimates that it's as low as under 1g of additional drag, so the point may be moot. Regardless of how far they extend, the ABLC dimples remain the foundation of the Zipp empire. The brand credits them with aerodynamic advantages at real-world yaw angles of 10 to 20 degrees, which compares favorably to many competitors whose minimum drag numbers manifest at yaw angles of five to 10 degrees--numbers that rarely occur outside of a wind tunnel. In non-tech terms, this means these wheels should outperform the competition in the conditions you'll actually encounter on the road.While Zipp is mostly known for bestowing free speed through aerodynamics, the disc brakes do something that rim-brake carbon can only dream of: surpass alloy in terms of modulation, responsiveness, and overall stopping power. These qualities are a big deal for climbing wheels, as knowing you can depend...
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Zipp 404 Firecrest Carbon Disc Brake Road Wheelset - Tubeless
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