The Zipp 303 Firecrest Carbon Clincher Disc Front Rim 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. 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.
Zipps updated 650b rims have an internal width of 21mm. The 303s 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 tires bead in place, even when ridden at lower tire pressures.
A new carbon fiber layup keeps weight low while maintaining the Firecrest Carbon Clinchers proven durability. To maximize aero benefit, Zipps ABLC dimples extend all the way to the outer edge of the rim. The robust 77D/177D hubset, paired with 24 Sapim® CX-Sprint spokes front and rear, keeps the wheels stiff and responsive.
To ensure compatibility with any bike, the versatile 77D/177D hubs come with swappable end caps to work with QRs 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.