Xtra (automobile)
 For the cargo bicycle producer see: XtracycleThe Xtra was an English three-wheel cyclecar built from 1922 to 1924 by Xtra Cars Ltd. of Chertsey Surrey. A very basic machine it was designed by Cuthbert Clarke and resembled a three-wheeled sidecar in most respects. The car was powered by a 3.75 hp single-cylinder two stroke 270 cc Villiers engine and had a friction drive two-speed transmission using two cork covered wheels of different sizes chain driven by the engine.