Go big, go gravel. The Zipp 303 XPLR SW and S are the fastest gravel wheels for everyone. Thanks to its mega-wide and deep rim, the wheelset forges a new path for gravel-specific cycling innovation and is purpose-built to match approved gravel tires. Why go big? - Too many of today's carbon gravel wheels are simply repurposed road wheels. This approach leaves riders with problems that slow them down: - Wheel aerodynamics are ruined by mismatched rim and tire widths. - Ideal tire pressures for gravel compromise bike control on narrow rims. - Wheel and tire interface often doesn't help prevent pinch flats. Greater Aero Efficiency at Higher Speed The 303 XPLR's deeper and wider rim design means better aero performance. At average race speeds (about 29-36kph), Zipp internal testing found 2-watt savings from aero efficiency gains compared with a peer wheel. The advantage grew to 10 watts or more when speeds exceeded 53kph on descents and other fast sections. Enjoy the benefits of going big: Speed Zipp's 303 XPLR wheelsets utilize an innovative wider rim width and greater rim depth to provide gravel racers with tangible benefits to increase speed and comfort over all types of gravel roads with gains in: - Aerodynamics - Vibration loss - Control