The seven-time MotoGP world champion wants to take on the most challenging cager races. MotoGP rider Valentino Rossi is one of the greatest talents in motorcycle racing. He's won 88 races and has taken the MotoGP championship title no less than seven times in his 16-year career. Now, as the 37-year old Italian edges closer to retirement, he wants to start racing on four wheels. Specifically, he's considering the Dakar Rally and the 24 Hours of Le Mans.