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Difficulty: MediumTyre Safety and Requirements

How will driving with tyres that are significantly under-inflated affect your vehicle?

  1. A
    Fuel consumption will decrease due to reduced rolling resistance
  2. Fuel consumption will increase and braking distance will be extendedAnswer
  3. C
    Tread wear will occur predominantly along the centre line of the tyre
  4. D
    Steering will feel lighter and more responsive when turning

Answer

Fuel consumption will increase and braking distance will be extended.
When tyres are under-inflated, the increased flexing of the tyre casing creates higher rolling resistance, which increases vehicle fuel consumption. Additionally, the deformed contact patch reduces effective braking grip and directional stability, leading to longer braking distances and potentially uneven shoulder wear.

Step-by-Step Solution

1
Evaluate the mechanical effect of low tyre pressure on rolling resistance and fuel economy.
Under-inflated tyres flex excessively and generate high rolling resistance, forcing the engine to work harder and consume more fuel.
Maintaining correct pressure minimizes drag and optimizes energy efficiency.
2
Evaluate the effect of low tyre pressure on tyre grip, stability, and stopping distance.
The contact patch becomes uneven with pressure concentrating on the shoulders, reducing optimal grip under heavy braking and lengthening stopping distances.
Correct inflation pressure is essential for even contact distribution and maximum braking performance.

Key Concept

Consequences of tyre under-inflation on vehicle efficiency and safety
Estimated Time:45s
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Topics

Tyre Safety and Requirements

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