Nope it doesn't make a difference if it is on a sloping driveway ..........
I'm not so sure. Does the tyre pressure depend on the load applied to the tyre at the contact point with the road/drive? The greater the load the more the tyre is deflected and (possibly) the smaller becomes the internal volume of the tyre, even though the mass of air in it remains the same. On a sloping drive the load on the contact point will be less than on a horizontal drive. The pressure difference may be small, but I think it may be finite.
Edited by L'escargot on 26/07/2008 at 13:00
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>>On a sloping drive the load on the contact point will be less than on a horizontal drive.
I disagree. The contact patch of the tyre to the surface will be exactly the same whether the ground is perfectly horizontal or whether it slopes upwards at say 45 degress.
The only time the contact patch of each tyre differs is say when you park on uneven ground so that the weight of the car is distributed differently depending on how each tyre touches the surface.
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>>On a sloping drive the load on the contact point will be less than on a horizontal drive. I disagree. The contact patch of the tyre to the surface will be exactly the same whether the ground is perfectly horizontal or whether it slopes upwards at say 45 degress.
I was talking about contact load (which is not related to contact area) and not contact pressure which is related to contact area. On sloping ground the contact load will be the weight on that axle multiplied by the cosine of the angle of the slope.
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>>but I think it may be finite.
There is a finite effect, but not one you would measure with typical tyre inflation apparatus.
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