Our 10″ Off Road Wheel Kit has 10″ solid rubber wheels that are 2″ wide and will never go flat. You can use these to roll your project car out into gravel, dirt, grass or even up in a car hauler while on the rotisserie. The casters are mounted on steel frames that slide into the legs of any of the AutoTwirler Rotisseries or Body Cart Plus. You do not need to remove the existing wheels. All Off Road Wheel Kits ship bare steel.