If a vehicle has radial tires, how should they be mounted?

Answer: C — On all four wheels.

When it comes to mounting radial tires, they should be installed on all four wheels of the vehicle. This is because radial tires are designed to work together optimally when they share the same construction and performance characteristics across all corners of the vehicle. Radial tires have flexible sidewalls and a tread design that allows better traction, improved handling, and enhanced ride comfort. If radial tires are only fitted to the front or rear wheels, it can lead to unpredictable handling, compromised stability, and decreased overall performance. Mixing radial tires with other types, such as bias-ply tires, can also create handling issues, as their physical designs and performance characteristics differ significantly. Therefore, achieving the best performance and safety requires consistent use of radial tires on all four wheels.