The Batcycle is known as the Batpod for The Dark Knight (2008) and The Dark Knight Rises (2012).[3][4][5] The bike has 20" front and rear tires and is powered by a high-performance, water-cooled, single-cylinder engine - geared toward the lower end for faster acceleration and with no exhaust pipes: the exhaust is routed through the hollow steel/aluminum/magnesium tubing used for the frame of the bike.[6] The Batpod is steered by the shoulders instead of hands, and the rider's arms are protected by shields. The two foot pegs are set 3½ feet apart on either side of the tank, which the rider lies on, belly down.[7] The engine noise was designed around the shepard tone, for which sound effects came, in part, from the sound of the Tesla Roadster's electric motor.[8] The Batpod ejects out of the Tumbler's front end, with the Tumbler's front wheels becoming the Batpod's front and rear wheels. Because the Tumbler is ordered to self-destruct, the Batpod allows Batman to continue his pursuit.