2015 Polaris Slingshot Three-Wheeler Uses General Motors Ecotec Power. Sponsored Links. Polaris is a company which is perhaps best known for its snowmobiles, ATVs and other off-road methods of transportation. The company’s latest creation, the Slingshot, is a step in the other direction. It’s referred to as a 3-wheel motorcycle and unlike the rest of Polaris’ products, is at home when carving corners on twisty, paved roads. The Slingshot has a reverse tricycle layout, with two wheels up front and one in the rear.