mile ovals with top speeds approaching 140 mph on the miles

For many years the venerable Harley-Davidson XR-750 has been the weapon of choice in the Grand National Twins Championship, but over the last few years the rules have been tweaked in an effort to open the Grand National Twins class to a variety of factories. The 2008 season saw riders entered on machines manufactured by Suzuki, Triumph, Yamaha, Kawasaki, KTM and BMW, all challenging the dominate Harley flagship.