The definition of “road cycling” now includes 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 Zipp 303 Firecrest 650b Tubeless Disc-brake wheelset. 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. At the center of the 303 650b Firecrest Tubeless is a versatile and durable hubset, the German-engineered ZR1 DB.

• Zipp graphics and cosmetic identity that scream speed
• Versatile 45mm rim profile for increased speed and better cornering, control and comfort
• Tubeless design provides secure performance when ridden at lower tire pressures
• ZR1 DB hubset is engineered in Germany with better seal design for improved durability and quicker response with 66 points of engagement
• Built with Sapim CX Sprint J-bend spokes
• Center locking rotor interface. Lockring is included
• Ships with 12mm front and rear end caps
• XDR™ or SRAM/Shimano driver bodies
• Campagnolo driver body sold separately

Size (wheels) 650B
Rim construction Carbon - w/Hooks
Tire compatibility Tube-type or Tubeless tires
Rim depth 45mm
Brake compatibility Disc (Center Lock)
Rim - inside width 21mm
Rim profile Symmetrical
Rim finish UD fiber, adhesive decals
Hub ZR1 Disc Brake
Driver body type n/a, SRAM XDR, SRAM/Shimano Road
Max tire pressure 125psi/8.6bar
Max recommended system weight 250lbs/114kg
Spoke Length DS 242mm, 248mm
Spoke Length NDS 246mm
Weight (g) 1520
Weight Based On Lightest configuration: through axles and XD body. No tape or valve included in weight