Why must you check the tyre pressure when the tyres are cold rather than after riding?

1. Riding heats up the air inside the tyre, causing it to expand and show a higher pressure reading than the actual cold baseline.
2. Tyres shrink when warm, which compresses the internal air and causes a lower pressure reading.
3. The valve stem seal only functions correctly when it is cold, preventing air leaks during measurement.
4. The rubber compound of a hot tyre softens and absorbs the air, making it impossible to take a reading.