What do you call a dual-suspension bike that is so light and so efficient that it literally blurs the difference between a hardtail and a duallie? We call them Razorbacks, and like their namesake, they are tough, fast, little buggers who like to play in the dirt. They are built to go fast and take a steady dose of training 4 days a week and racing on the weekends. The official race bike of the reigning Xterra off-road series champion likes to show its stuff here on Vashon at Dockton Park, where the roots and off-camber turns show what this little pig can do.