Racer X Films: Vegas Track Preview May 5, 2012 12:10am | by: Matt Francis Home Supercross Multimedia Video Racer X Films Racer X Films: Vegas Track Preview - Supercross Las Vegas, NV Las VegasMonster Energy AMA Supercross Championship Davi Millsaps, Justin Brayton, Ryan Dungey, Eli Tomac, and Justin Barcia ride the Las Vegas SX track for press day.