The Xzilarator is a custom machine created by Bob Kinney and it comes with three wheels. The Xzilarator costs approximately $3,500 USD (plus the bike) to build and be made street-legal. This number can fluctuate in either direction as the final cost depends greatly on the parts used to build your own Xzilarator. It is about a simple transformation from a bike to a three wheeler that will approximately take you a couple of months depending on the number of hours you wish to put in on each day. If you want your own version of the Xzilarator, then check out their website.