ZIPP rear wheel 28" 303 Firecrest Carbon Clincher | Tubeless | Center Lock | 12x142 mm thru axle | SRAM XDR
Originally developed to win the spring classics of road pros, the current 303 Firecrest generation is the optimal everyday companion for semi-perfect conditions, bad roads and adverse elements. Under such circumstances, the current 303 is even more efficient and faster than its predecessor. With an inner rim width of 25 millimeters, which is extreme for racing bikes, the Americans are breaking new ground. As found out in Zipp's in-house "The Nest" development center, 28 millimeter wide road tubeless tires with low air pressure roll significantly better than comparable 25 millimeter tires. Especially in poor road conditions, wide all-road tires can demonstrate their advantages in terms of rolling resistance and comfort. Due to the large inner rim width, the rims not only offer wider tires optimal support at low air pressures, they also integrate the tires aerodynamically extremely efficiently into the rim profile. In addition, the hookless design creates an almost seamless transition between tire and rim flanks. The omission of the hooks also makes the rim flanges more robust in the event of punctures and contributes to the significant weight savings compared to the previous versions. The reduced profile height of 40 millimeters makes the 303 even more agile and easy to control even in gusty winds.
Total System Efficiency (TSE)
The 303 Firecrest wheels were developed under the TSE approach. The development goal was to find the best possible impeller design to overcome the speed barriers that exist under realistic driving conditions. In addition to wind resistance, gravity and rolling resistance, this also includes vibration losses in poor road conditions.
ABLC Sawtooth Dimples
The redesigned ABLC Sawtooth dimple design consists of 12 branch points that are timed to match in the rotating impeller. From a frequency of 50 Hz, which corresponds to a speed of 32 km/h, the dimples can demonstrate their aerodynamic advantages and help you to achieve more speed. However, the indentations not only reduce drag, they also ensure very high crosswind stability, especially at larger angles of attack.
Zipp ZR1 hubs
The Zipp ZR1 hubs were developed in two years of development work in Germany. Its most outstanding feature is the extremely finely toothed freewheel body design of the rear wheel hub with 66 locking points per wheel revolution, which allows the ZR1 to react to acceleration without delay. The fine toothing is realized via a system of 6 pawls, of which 3 pawls engage offset. The design of the seals is based on the high-end Cognition hubs and provides more protection and durability with a larger dust cap behind the freewheel body and better seals.
Zip Lifetime Warranty
Zipp gives you a lifetime guarantee on your Zipp wheel if used properly. The warranty also includes racing and damage caused by rider error, as long as the wheel has been used for its intended purpose. The guarantee only applies to the original purchaser and proof of purchase is mandatory!
NOTE: Due to the hookless profile, the Zipp 303 Firecrest wheels are only suitable with the use of ETRTO-compliant tubeless tires. However, the corresponding tubeless tires can be ridden with tube on the wheels without any problems. You can find an overview of all compatible tires for your Zipp hookless wheelhere .
Technical specifications:
intended use : Gravel, road bike, cyclocross
Wheel size: 28" (ETRTO: 25-622)
Rim Type: Carbon Clincher (clincher and folding)
Brake type: only for disc brake
Brake disc mount: Center Lock
Materials: carbon, aluminum
Inner Width: 25mm
External width: 29.3mm
Rim Height: 40mm
Number of holes: 24 holes
axle type : 12x142 mm thru axle (QR12)
bearing : 4x industrial bearings
Freewheel compatibility: 12-speed SRAM XDR
Freewheel type: 6 pawls, 66 detents per wheel revolution
Spokes: 24x Sapim CX-Ray J-Bend (black)
tubeless capable: yes
recommended tire width: 28-55 mm
Maximum system weight: 115 kg (rider, bike, clothing and possibly luggage)
maximum tire pressure: 5 bar
Finish: UD carbon matte
Color: black, gray logos
Weight according to the manufacturer: 739g
Weight weighed: 768g (including tubeless tape and tubeless valve)
Scope of delivery:
1x rear wheel Zipp 303 Firecrest
1x tubeless rim tape
1x tubeless valve