What does the "R" in a tire size signify?

The "R" in a tire size indicates that the tire is of radial construction. Radial tires have layers of fabric that run radially across the tire, which is perpendicular to the direction of travel. This design allows for improved performance in terms of traction, handling, and longevity compared to older tire designs, such as bias-ply tires. The radial construction provides better flexibility in the sidewalls, which contributes to better contact with the road surface and enhances ride comfort.

Understanding the designation of tire construction helps consumers choose the right tires for their vehicles, especially given that most modern vehicles utilize radial tires for optimal performance. This distinction is essential for ensuring that tires are suitable for the specific requirements of a vehicle’s operation and handling characteristics.