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Nitrogen is used to fill tyres for several reasons:
1. Nitrogen molecules are larger than oxygen molecules, so they are less likely to leak through the tyre rubber, which can result in maintaining tyre pressure for a longer time.
2. Nitrogen is a dry gas and does not support moisture. The interiors of tyres can experience some degree of humidity, which can affect the tyre pressure when it heats up. Using nitrogen eliminates this issue.
3. The lack of oxygen in a nitrogen-filled tyre can reduce the rate of degradation of the rubber and wheel, prolonging their lifespan.
4. Nitrogen is less likely to cause pressure changes in the tyre due to temperature fluctuations, which can lead to a more consistent performance.
5. Nitrogen is non-combustible, enhancing safety in case of a fire.