What must an inspector check on tires before passing inspection?

An inspector is required to check the condition, tread depth, and pressure of the tires to ensure vehicle safety and compliance with state regulations. The condition of the tires is crucial as it affects traction, braking, and overall vehicle performance. Inspectors look for any signs of wear, damage, or irregularities that could compromise safety on the road.

Tread depth is particularly important, as it directly impacts the vehicle's ability to grip the road, especially in wet or slippery conditions. Pennsylvania regulation typically mandates a minimum tread depth to help prevent hydroplaning and improve handling.

Tire pressure is also checked to confirm that it meets the manufacturer's specifications. Proper tire inflation ensures optimal contact with the road, maximizes fuel efficiency, and enhances the vehicle's overall handling characteristics.

The other options involve aspects that, while potentially informative, are not relevant to the practical safety assessments conducted during a state inspection, focusing instead on attributes that do not directly influence the performance and safety of the tires in operation.