Jonny Walker is a rising force on the extreme enduro circuit and the biggest rival to Graham Jarvis, the undisputed king of the sport. This former top British youth trials champion switched to enduro full-time in 2010 and he's steadily been making his name known. He's a top-three rider in the British Sprint Enduro Championship, the International Six Days Enduro, and the FIM SuperEnduro World Championships. In June 2012, he won the Erzberg Rodeo, the most grueling of the Red Bull Hard Enduro Series. In February he finished second at Hell's Gate for the second year in a row. With his diverse skills and Erzberg confidence, Walker definitely has the potential to earn an X Games medal.