The September digital edition of Racer X Illustrated has been released! The 2013 Lucas Oil Pro Motocross Championship is in full swing, so grab your copy now to read about this season's front-runners, Malcolm Stewart's chance in the spotlight, and Adam Cianciarulo's highly anticipated pro debut. You'll find coverage of all these and much more in the September issue of Racer X. The issue has also been shipped to subscribers and is available for purchase via Apple Newsstand.