Tire Chains FAQ: What does R mean in my tire size?

"R" designates radial tire.

Nearly all tires today are radial. Therefore, if our tire chains charts show with or without the "R"; the snow chains will fit either designation. For example P195/75R-15 is the same as P195/75-15 or 11-22.5 is the same as 11R22.5.

Snow tires, Mud and Snow (M&S), recaps, deep lug mud tires and other oversized may require longer tire chains.

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