Big Dog K-9 motorbike controls the road as it flies into the open air ahead. This stylish and demanding motorbike is fabulous for a long road trip or getaway that allows the biker to leave the whole world behind. Every Big Dog bike features a V-Twin 117 cubic inch engine, 6-speed transmission, one-piece steel tank and right side drive. What sets Big Dog apart is customization. Numerous paint and graphic options are available, as are custom seats, exhausts, grips, windshields and more.