Which of the following describes the condition of the tread on non-steering wheels?

The condition of the tread on non-steering wheels is accurately described by requiring at least a tread depth of 2/32 inch. This minimum tread depth is crucial for ensuring sufficient traction, particularly in wet conditions, as it assists in channeling water away from the contact patch and reducing the risk of hydroplaning. This specification is critical for safety and is part of the basic requirements outlined in commercial driving regulations.

Other options present information that is not in line with standard requirements. The second choice indicates a higher tread depth than necessary, which is not a requirement for non-steering wheels. The option regarding under-inflating the tires contradicts the principles of safe tire maintenance, as under-inflation can lead to excessive wear and potential blowouts. Lastly, a mere visual inspection without measuring tread depth does not meet the thoroughness required for a pre-trip inspection, as a visual assessment alone may not reveal inadequate tread that could compromise safety during operation.