Zipp 303 Firecrest 650b tubeless disc

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  • 303 Firecrest 650b Carbon Clincher Tubeless Disc brake
    The definition of what’s considered “road cycling” has evolved to include gravel and dirt as well as pavement. At the same time, bikes are evolving to meet the fit requirements of smaller riders. Meeting these two distinct needs was the driving force behind the new Zipp 303 Firecrest 650b Carbon Clincher Tubeless Disc-brake wheelset.

    This wheel-set shares the same proven innovations as the full line of Carbon Clincher Tubeless Disc-brake wheels. The difference is size. A 650b wheel has a 584mm bead seat diameter rim vs. the 622mm diameter of a standard 700c road rim.

    Foremost, the 303 Firecrest 650b Tubeless Disc-brake wheel-set is an ideal choice when the pavement ends. The smaller rim size provides room within frames and forks for larger tires, 28mm or wider, that deliver increased comfort, compliance, and cornering performance. With more tire between the rim and the ground, the overall wheel diameter including the tire is similar to a standard 700c wheel and road tire combination.

    Back on the pavement, the 650b is a better fitting wheel for smaller athletes riding compatible frames. For too long, many smaller cyclists have trained and raced on standard 700c wheels, losing out on the advantages of a proper fitting wheel such as improved handling and the elimination of front wheel toe overlap.

    Zipp’s updated 650b rims have an internal width of 21mm. The 303’s 45mm rim depth is an ideal option for every terrain or road surface. Designed to be tubeless compatible, this setup option allows you to run lower tire pressure for increased comfort and cornering grip along with a reduced chance of pinch flats. For added security, the rim bed features internal ridges to lock the tire’s bead in place, even when ridden at lower tire pressures.

    A new carbon fiber layup keeps weight low while maintaining the Firecrest Carbon Clincher’s proven durability. To maximize aero benefit, Zipp’s ABLC dimples extend all the way to the outer edge of the rim. The robust 77D/177D hub-set, paired with 24 Sapim CX-Sprint spokes front and rear, keeps the wheels stiff and responsive.

    To ensure compatibility with any bike, our versatile 77D/177D hubs come with swappable end caps to work with QR’s and thru-axles, including 12x100mm and 15x100mm front thru-axles as well as 12x142mm rear thru-axles. The 177D rear hub is also XDR driver body compatible for use with SRAM 10-42 cassettes.

    With the introduction of the 650b, the Zipp 303 Firecrest—now more than ever—is a wheel without limits.


    Firecrest - Not only is Firecrest more aerodynamic than any other rim design, it improves handling in crosswinds and overall ride quality.

    Carbon Clincher - Our superior Carbon Clincher technology is the culmination of two years of intensive prototyping and testing. We worked with our composites supplier to develop an exclusive heat-resistant resin based on the materials used in motorsports brake systems. This proprietary technology improves heat management so substantially that all Zipp Carbon Clinchers pass stringent CEN safety standards.

    • Set Weight: 1450g
    • Max recommended rider weight: 113Kg (250lbs)

    Front Wheel
    • Weight: 665g
    • Hub Used: 77D
    • Hub Width: 100mm
    • Rim Depth: 45mm
    • Max Width: 28.9mm
    • Internal Width: 21mm
    • Spokes: Sapim CX-Ray
    • Spoke Count: 24
    • Spoke Pattern: 2 cross
    • Spoke Length Drive: 254mm / straight pull
    • Spoke Length Non-Drive: 252mm / straight pull
    • Track Adaptable: No
    • Dimpled Surface: Yes
    • Nipples: Sapim Secure Lock
    • External Nipples: Yes
    • Thru Axle Compatible: Yes
    • Tubeless: Yes

    Rear Wheel
    • Weight: 785g
    • Hub Used: 177D
    • Hub Width: 135mm
    • Rim Depth: 45mm
    • Max Width: 28.9mm
    • Internal Width: 21mm
    • Spokes: Sapim CX-Ray
    • Spoke Count: 24
    • Spoke Pattern Non-Drive: 2 cross
    • Spoke Pattern Drive: 2 cross
    • Spoke Length Non-Drive: 254mm / straight pull
    • Spoke Length Drive: 252mm / straight pull
    • 10 or 11-speed Compatible Hub: Yes
    • XDR Compatible:: Yes
    • Track Adaptable No
    • Dimpled Surface: Yes
    • Nipples: Sapim Secure Lock
    • External Nipples: Yes
    • Thru Axle Compatible: Yes
    • Tubeless: Yes
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This item is crafted in the U.S.