Why should tyre pressure be checked when the tyres are cold?
Answer and explanation
Correct answer: A. Driving warms the air and raises the reading
- Step 1: Heat raises air pressure. Step 2. Check before the journey. Answer: Driving warms the air and raises the reading. Why not the others: Cold tyres hold a higher true pressure than warm ones: a warm tyre reads higher, not a cold one. The gauge only works when the engine is off and cooled down: the gauge works in any condition. Warm tyres lose air faster through the valve: the reading changes, but they do not leak faster.
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