Tire sizes for the RAM 1500 vary from 225/75 R16 up to 285/45 R22. The sizes vary depending on the year of the RAM 1500 and the version of the truck.
The RAM 1500 first appeared as a 1994 model year truck. It was meant to serve as the lighter weight, lower powered partner of the RAM 2500 and RAM 3500. It has been in production alongside these other truck models every year since introduction.
The RAM 1500 has a wheel diameter ranging from 16 inches up to 20 inches. It's tire sizes vary in size, too. The best way to a RAM owner to determine the right tire size for his or her vehicle is to check the tire information on the sidewalls of his or her existing tires.