What is the minimum rear tire tread depth for commercial vehicles?

The minimum rear tire tread depth for commercial vehicles is indeed 2/32". This requirement is in place to ensure that tires can provide adequate traction and handling, especially in adverse weather conditions. Tread depth is crucial because it affects the tire's ability to grip the road, particularly on wet or slippery surfaces.

When the tread wears down to this minimum level, the risk of hydroplaning increases significantly, which can lead to dangerous driving conditions. Maintaining the proper tread depth is not only a matter of safety but also a legal requirement for commercial vehicles, which are often held to stricter standards due to their size and weight.

The other options list greater tread depths, which may be beneficial in terms of performance in certain conditions, but they do not reflect the minimum legal requirement, making them unsuitable as correct answers.