Correct answer
When cold.
When cold, using a suitable gauge and the pressure specified for load and use. Riding raises temperature and normally pressure, so a hot reading cannot be compared directly with the cold specification. This does not mean the gauge stops measuring correctly or that a hot tyre should be deflated to that value. Follow the manufacturer’s instructions and do not wait until it looks flat.
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Only when they are deflated.
When cold.
When hot.
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