ZIPP 303 XPLR SW WheelsetThe Zipp 303 XPLR SW is big enough for your biggest gravel goals. Just how big? This wheelset is the fastest on gravel, thanks to its mega wide rim that integrates seamlessly with approved gravel racing tires.* Most gravel wheels are modified versions of existing road wheels, focusing on stiffness and lightweight. Zipp takes a different approach. In gravel, resistance and vibrations from bumpy surfaces create a barrier that slows riders down. To