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Difficulty: EasyTyre Safety and Requirements

You are preparing to carry a heavy load of luggage and passengers in your car for a long journey. What adjustment should you make to your tyres?

  1. A
    Reduce the tyre pressures to create a larger contact patch with the road
  2. Increase the tyre pressures according to the vehicle manufacturer's handbookAnswer
  3. C
    Keep tyre pressures at their normal level as long as the tread depth is at least 1.6 mm
  4. D
    Deflate the tyres slightly to improve braking grip and prevent skidding

Answer

Increase the tyre pressures according to the vehicle manufacturer's handbook
When a vehicle is carrying a full load of passengers and heavy luggage, the additional weight compresses the tyres. Increasing the tyre pressures to the manufacturer's recommended loaded settings ensures the tyre maintains its proper contact patch, prevents overheating from excessive sidewall flex, and maintains safe steering and braking response.

Step-by-Step Solution

1
Identify the operating condition changes affecting the vehicle
The car is carrying additional weight from multiple passengers and heavy luggage.
Added payload places higher load forces onto all four tyres, altering their contact patch and sidewall flex.
2
Determine the correct maintenance procedure for a heavily loaded vehicle
Consult the vehicle handbook or tyre placard to find the specified higher tyre pressure setting.
Vehicle manufacturers specify distinct higher pressure settings for heavy loads to preserve handling, braking performance, and tyre integrity.

Key Concept

Tyre pressure adjustments for heavy vehicle loading
Estimated Time:45s
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Topics

Tyre Safety and Requirements

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