Tire pressure monitoring has generally meant a sensor clamped over the valve stem, adding rotating mass and one more thing to knock loose. Zipp molds the AXS Wheel Sensor into the carbon of the 303 SW instead, seating a cartridge over the valve inside a cavity in the rim. Set your target pressure in the AXS app, then bounce the bike and the sensor wakes and flashes green if pressure is in range, slow red if it is low, and a double red flash if it is high , with monitoring continuing through the ride so issues get caught early .

The rim underneath borrows from the 303 XPLR gravel platform: 40mm deep with a 25mm internal width , 33mm external , with ABLC SawTooth dimpling across the surface to manage airflow. The profile is optimized around tires from 30mm to 35mm and listed as compatible out to 44mm , which puts the aerodynamic sweet spot where all-road tire trends have landed. Wide external uprights shield the casing from the square-edged hits that cause pinch flats , and a new carbon layup is said to improve impact resistance by almost 10% .

The bead is hookless, and that carries rules. Only tubeless tires should be mounted — the reinforced bead a hookless rim requires — and maximum pressure is 73psi / 5.0 bar . Tubes are an emergency fix rather than a setup, and the wheel is only compatible with a SRAM sealant injector , so a standard injector will not thread into the valve. Check the approved tire list before committing to a casing.... Read More