Rotax MAX U.S. Grand Nationals at Miller Motorsports Park

The Rotax MAX Challenge (RMC) is a professional kart racing series established, owned and organized by BRP-Powertrain and its distributors. The RMC is a "one-make-engine" formula: only Rotax kart engines are allowed. There are seven different race classes: 125 Micro Max, 125 Mini Max, 125 Junior Max, 125 Senior Max, 125 Masters Max, 125 Max DD2 and 125 Max DD2 Masters.