What is a sign of defective tires on a vehicle of 5500 kg?

• A. Less than 2mm of tread on the front tires
• B. Less than 3mm of tread on the front tires
• C. Less than 2.5mm of tread on the rear tires
• D. Less than 1mm of tread on the rear tires

Answer: (B)

The correct answer highlights an important safety concern regarding vehicle maintenance, specifically the tread depth of tires. For a vehicle weighing 5500 kg, having less than 3mm of tread on the front tires is indicative of a defective condition, as insufficient tread can severely limit traction, especially in adverse weather conditions.

Tires are designed with tread patterns that help disperse water, provide grip, and maintain stability when turning or stopping. When the tread wears down to below the recommended depth, the risk of hydroplaning increases, and the vehicle's ability to stop effectively decreases.

Maintaining appropriate tread depth is crucial for ensuring optimal handling and safety. For front tires, where steering and braking take place primarily, a tread depth of less than 3mm signals that they may not perform adequately, making them potentially defective.

While the other options mention insufficient tread depths as well, the specifics provided in the correct choice align with industry standards for safe tire condition, particularly for a heavy vehicle like the one in question.