What is the minimum tread depth required for commercial vehicle tires?

The minimum tread depth required for commercial vehicle tires is critical for ensuring safety and maintaining traction on the road. The requirement of 4/32 of an inch for steer tires is due to their role in providing directional control and stability, especially since these tires are responsible for steering the vehicle. Adequate tread depth is essential on steer tires to prevent hydroplaning and to ensure proper grip in various weather conditions.

On the other hand, a minimum tread depth of 2/32 of an inch for other tires, including drive and trailer tires, is allowed because while they also require sufficient tread for safe operation, they do not bear the same responsibility for steering control as steer tires. This difference in tread depth requirements reflects the varying roles that different tires play on a commercial vehicle. Adequate tread depth across all tires contributes to overall vehicle performance, safety, and compliance with regulations, making this answer the best choice.