With the right gear, the speed doesn't end when the pavement does. Zipp knows that your commitment to pushing boundaries expands to the places you ride and the events you do. Today's screaming descent may be on a mountain fire road, the pack's crucial selection on a gravel farm lane. Zipp realizes in all circumstances that efficiency equals speed. The 101 XPLR offers a single-wall rim design with our proprietary "Ankle Compliance" technology, while the 303 Firecrest and 353 NSW feature Total System Efficiency.