What does the 'R' in a tire label (e.g., 225/50 R 17) signify about the tire's construction?

The 'R' in a tire label indicates that the tire is of radial construction. Radial tires have plies that run radially from the center of the tire, which helps provide flexibility and better performance in terms of traction, fuel efficiency, and ride comfort. This construction allows for less rolling resistance, which is beneficial for fuel economy and overall handling.

In contrast to radial tires, there are also bias-ply tires where the layers are laid at opposite angles. However, radial tires are more commonly used in modern vehicles because of their superior performance characteristics. Understanding this tire construction type is essential for selecting the appropriate tires for specific driving conditions and preferences.