Description: This show is about Sho Yamato and his 5th grade friends, Kakeru Sakamaki and Makoto Shido. They all enjoy mountain biking. Another team of mountain bikers known as "Shark Tooth" challenge them to a race but during this race they get transported to another world called the X-Zone by black smoke. To have any hope of returning, they must compete in the "Idaten Battles" which are dangerous mountain biking competitions in a multitude of areas and terrains.