Former motocross rider and Hollywood stuntman Steve Boyum's glimpse into the "second-fastest-growing motorsport in the U.S." is anything but a dramatic masterpiece. But it features enough dirt-eating, bone-jolting, face-planting race action to send the audience directly from the popcorn stand to the chiropractor's office. TV transplants Steve Howey (Reba) and Mike Vogel (Grounded for Life) star as a pair of fatherless Southern California brothers scuffling along as pool boys and do-it-yourself weekend motocross riders. When one of them gets a shot at a big-time ride, sibling rivalry sours into hostility. Throw in a pair of girlfriends (Cameron Richardson, Sophia Bush) and some on-track rivalries, and you've got the usual racing-movie package. Forget all that: The real attraction here is knobby-tired motorcycles and their flashy riders sailing through the air, jumped up by a thunderous rock score. If you love Kawasakis, Hondas, and Yamahas, and don't mind tin-eared writing, get down to the multiplex.