ElliptiGO, Inc. is a manufacturer of stand-up and elliptical bicycles headquartered in Solana Beach, California. Elliptical bikes combine the motion of an indoor elliptical trainer with the outdoor mobility of a traditional bicycle. They are a type of treadle bicycle, powered by treadles, rather than pedals mounted directly on the crank arms. Treadle drive trains were historically intermediate between highwheeled penny-farthings and the bicycle chain; Elliptigos, like some other later treadle bicycles, use both treadles and a chain.