The sizzling speed of Zipp’s 404 Firecrests is usually witnessed from behind, in the pack, as the rider with these speedy hoops pulls away. With the aero advantage of Zipp's 58mm-deep, dimpled carbon Firecrest rims, the 404s are a favorite in the amateur racing ranks and also in the pro peloton. Their agile weight propels them up climbs and allows rapid acceleration out of corners. At 27mm-wide, the rims not only increase your aerodynamic edge, they also provide a supple ride quality and impressive cornering while minimizing rolling resistance. Plus, you'll love Zipp’s incredibly stiff hubs with oversize axles and smooth Swiss steel bearings. And, everything is pulled together with fine Sapim CX-Ray spokes to give you every advantage on the road.
Zipp’s amazing Firecrest rim is more aerodynamic than any other, plus it improves handling in crosswinds, wheel strength, and overall ride quality. Here’s how:
Previous rim shapes were designed to smooth airflow coming off the tire, and tapered inward from the widest point of a toroidal bulge. Zipp’s Firecrest rims have a less pronounced bulge and maintain a near-constant width almost all the way to the spoke bed. Without giving up the proven benefits of the toroidal shape, Firecrest is the first aero profile that effectively controls airflow around the back half of the wheel.
The benefits are substantial. With Firecrest, the latest Zipp 404 Tubular (58mm rim depth) matches the aerodynamics of the pre-Firecrest 808 (81mm depth). And the new 808 Tubular is faster than any competitor’s 90mm rim.
Using computational fluid dynamics (CFD), Zipp discovered subtle variations in rim shape that improve stability without increasing aerodynamic drag. By moving the center of pressure (the focal point of side forces on the rim) to its optimal location near the steering axis, Firecrest rims offer stable, predictable handling at every wind angle. In real-world conditions, Firecrest rims are markedly more stable than other rims of equal or even shallower depth.
More control, comfort and strength, too
Firecrest rims are also wider, which increases lateral stiffness for sprinting and cornering, and offers greater vertical compliance for more control, comfort, and durability, without adding rolling resistance.
Carbon is renowned for its outstanding stiffness, vibration-damping ride quality and out-of-this-world lightness. However, it does not have as much impact resistance as aluminum. Zipp solves this issue and furthers their reputation for making some of the world's best functioning wheels with their Carbon Bridge technology. Kevlar threads woven through the carbon in the prime impact zones boost the rim's impact strength by an outstanding 28%. Carbon Bridge technology means you can ride your Zipps for years to come over the roughest roads with the confidence that you have some of the fastest and strongest wheels going.
Zipp's Visco-elastic Constrained Layer Control improves ride quality by inserting a vibration-damping material between layers of structural carbon, reducing road vibration by up to 10% and giving you a ride that is both blazingly fast and decadently smooth.
Tubular (sew-up) tires required
Includes Zipp quick release, valve wrench, valve extender, 10-speed spacer and Platinum Pro EVO brake pads
|Rim Material||Carbon, 58mm-deep|
|Weight (Front/Rear)||584 grams|