What does R mean in my tire size?Updated 10 months ago

In a tire size, the "R" stands for "radial." The letter "R" indicates that the tire has radial construction, which is the most common type of tire construction used in modern vehicles. Radial tires have layers of cords or plies that run radially across the tire from bead to bead. The "R" designation has become the standard for passenger vehicles. If you see the letter "R" in your tire size, it simply confirms that your tires are of radial construction.

"R" or no "R" doesn't make a difference when sizing tire chains.