Since its rim is 58mm deep, it's easy to assume that Zipp's tubeless 404 Firecrest Carbon Disc Brake Road Wheel has a one track mind: aerodynamics, all the time, and nothing more. Zipp's history also supports that assumption. But now that its equipped with disc brakes and a tubeless-ready bead, the focus shifts slightly. The wheels stop better than ever, and the lower PSI of tubeless means they roll more efficiently, more comfortably, and with less risk of punctures. 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 on your brakes means you can carry more speed into corners, brake later, and not worry about locking your wheels up when an unexpected obstacle--an off-leash dog at a trailhead, the inevitable sudden motorist, r...
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Zipp 404 Firecrest Carbon Disc Brake Road Wheel - Tubeless
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