Zipp 303 SW Carbon Rear Wheel Zipp’s 303 SW Rear Carbon Wheel delivers premium performance across every surface including tarmac, gravel, cobbles and cyclocross. Combining speed, comfort and strength, the 303 SW is ideal for riders who demand more from their wheels. Featuring integrated SRAM AXS tyre pressure monitoring via the in-rim Zipp AXS Wheel Sensor, riders can view pressure instantly before a ride and monitor it live while riding. This avoids the need for any external device on the valve stem and helps keep tyre pressure optimised throughout changing conditions. With a 40mm deep rim profile based on the gravel-oriented 303 XPLR, the wheel supports wider tyres and improves aerodynamic performance. The wide rim helps reduce rolling resistance and allows for lower pressures that improve comfort and grip. Thanks to its carbon layup refinement, the 303 SW offers nearly 10 percent greater impact strength at a light weight. The rim is engineered to work best with tyres measuring 30 to 35mm wide and is shaped to protect against pinch flats during impacts. The wheel is completed by the ZR1 hub, which now includes stainless steel bearings for smoother and longer-lasting performance.