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Zipp 303 Firecrest Clincher Rim (Zipp X45)

Zipp 303 Firecrest Clincher Rim (Zipp X45)

While Wheelbuilder doesn't offer the Zipp 303 Firecrest (X45) clincher rim for individual sale, we can custom build your dream set of Zipp wheels using this rim. To view our custom build product offerings please visit our Custom Zipp 303 Firecrest Front Wheel, Custom Zipp 303 Firecrest Rear Wheel, and Zipp PowerTap Wheel pages.

Zipp's 303 Firecrest Carbon Clincher (X45) rim has all the hallmark characteristics of the 303 but has been redesigned with Firecrest shaping. Zipp's Firecrest aero profile is the first deep-profile carbon clincher design to offer the superior aerodynamics, ride quality, strength, and handling of a wider rim body.

The Firecrest shaping optimizes the aerodynamic profile of both the front half and the back half of the wheel. In addition, Firecrest moves the center of pressure of the wheel backwards, giving the 45mm-deep rim the crosswind stability of a box-section rim. At the same time, the 26.2 mm-wide brake track allows the clincher tire to take on a wider, more stable shape without compromising rolling resistance.

Heavy, continuous braking on carbon surfaces can cause spikes in rim temperature and tire pressure that impact performance and handling - especially with clincher tires. To solve this challenge, Zipp's US-based composites supplier created a new heat-resistant resin exclusively for Zipp. This technology improves heat dissipation so substantially that these are the only carbon clinchers to pass stringent European safety testing without limitations on rider weight or brake pad options.

In the past two years, the Zipp 303 has emerged as one of the most formidable rims in the pro peloton, with wins in the Tour de France, Paris-Roubaix, the Tour of Flanders and more. Its speed, light weight, and utter reliability have been proven in pro cycling’s most demanding races.

Additional information:

  • Not available for individual sale
  • Weight: 500g
  • Hole count: 18, 20, 24, 28
  • Rim profile: 45mm
  • Aero Width: 28.5mm
  • ERD: 550mm
  • Zipp Aero Data
  • Ideal use: road racing, criteriums, climbing and triathlon.


The Zipp 303 Firecrest (X45) clincher rim is not offered for individual sale. Wheelbuilder can customize your Zipp 303 Firecrest (X45) rim with your choice of hub, spokes, and nipples. Visit our Custom Zipp 303 Firecrest Front Wheel and Custom Zipp 303 Firecrest Rear Wheel pages to view our product options. We can also custom build a Zipp PowerTap Wheel using the 303 Firecrest (x45) rim.

Product Weight (g) 500
Have a question? Need more information? Ask us a question.
Answered on Sep 19, 2016
A 28 hole 303 or 404 would be great options for you. We recommend using a heavy duty bladed spoke such as the DT Aero Comp, brass nipples, and a hub that is optimized for stiffness, such as the Chris King R45 or the Industry Nine Torch.

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