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by Daniel on December 25th, 2006

Daniel

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Why will The pressure of air in a tyre remain the same whether it is supporting the weight of the vehicle or not?

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  • by H_mood on December 26th, 2006

    H_mood

    Why indeed? I think the pressure will go up, if the tyres are bearing the load of the car. Let's say the car is a ton (1000kg), and for the sake of simplicity, the supporting area is 400 cm^2 (tyre 20cm wide, x 4 x 5cm strip touching the road), so it is a load of 2.5kg per sqcm, which is 2.5 atm. That is roughly the right order of magnitude. This is the pressure you need to support the car (obviously, because the tyre will collapse if you get a ..hehe.. flat tyre).

    That the pressure does not go down much if you lift the car: the tyres are not as floppy as a balloon, the volume will only increase a bit (basically the tyre will become fully round, instead of being sqeezed at the point of contact). So the pressure will drop only a bit, but it will! Otherwise the tyre would be very stiff, and would not dampen the shocks, as it does and should.

    Comments

    • I will test your theory tomorrow. I had become so confused by the problem i neglected the simplest aspects. Thank you very much.

      Daniel

      by Daniel on May 10th, 2007

    • Hi Daniel, any experimental results, yet?

      H_mood

      by H_mood on May 17th, 2007

    • Yes. You were quite right. Using a more sensitive pressure gauge i found that tyres with very stiff walls (such as run-flats and low profiles)showed a negligable change in pressure under load where as, conversely, high profile less rigid walled tyres had a more pronounced (albeit small) change. Thanks again.

      Daniel

      by Daniel on July 19th, 2007

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