Short Answer
A tire is considered cold when the air inside the tire is at the same temperature as the surrounding ambient air. This can be achieved when the vehicle has been parked for at least 3 hours without direct sunlight on the tires.
Detailed Explanation
What makes a tire “cold”
A tire is considered cold when the air inside the tire is at the same temperature as the surrounding ambient air.
In practical terms, this means:
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The vehicle has been parked for at least 3 hours without direct sunlight on the tires.
Under these conditions, pressure readings reflect true Cold Inflation Pressure.
What affects CIP accuracy
Cold Inflation Pressure is influenced by temperature.
The following factors will impact tire pressure and may cause inaccurate CIP measurement:
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Driving, even short distances
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High vehicle load during operation
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Direct sunlight on one side of the vehicle
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Large changes in ambient temperature
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Road surface temperatures
Even a short drive can increase pressure by several percent.
Why this matters
All manufacturer recommended tire pressures are defined as Cold Inflation Pressure values.
If you measure pressure while the tire is warm:
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You may under inflate the tire when adjusting
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Tire wear and performance may be affected
When to measure or adjust tire pressure
Measure or adjust tire pressure only when:
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The vehicle has been parked for at least 3 hours
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Tires are fully shaded
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The vehicle has not been recently driven
If unsure, wait longer before adjusting pressure.