What should the rear tires' tread depth be?

Answer: A — 2/32 inch

The appropriate tread depth for rear tires should be a minimum of 2/32 inch. This depth is essential for maintaining adequate traction on wet or slippery surfaces, as tread grooves help channel water away from the tire and reduce the risk of hydroplaning. When the tread is worn down to 2/32 inch, it indicates that the tire is approaching the end of its usable life, especially in terms of safety and performance. Maintaining proper tire tread depth is critical for vehicle safety, as it directly affects braking distance, handling, and overall stability of the vehicle. Tread depths greater than 2/32 inch, such as 4/32 inch, 6/32 inch, or 8/32 inch, would indicate better traction and handling performance but are not the minimum requirement according to standard guidelines. In summary, ensuring that rear tire tread is at or above 2/32 inch ensures a basic level of safety for driving conditions.