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T APLUS 22
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October 2003

Re: right tyre pressures for 235/45/17's?

Sun, 04 January 2004 14:40

HighRolla wrote on Mon, 05 January 2004 00:22

is there a trend with higher pressures in lower profile tyres? If so, anyone know of the main reason for this?

Note: Aspect ratio (AR) is the more professional approach to describing the profile of a tyre, as the sizes '45' '50' are in respect to the width of the tyre.

With lower profile tyres you obviously have much less room from the ground to the hub. So at 32psi it wouldn't take much to push a tyre with an AR of 40 to the hub and cause damage, and possibly a blowout. So you need to up the force acting on the inside of the rubber to make sure the tyre walls are able to absorb the 'rock'/'Rail track' on the road given the lower distance it has to travel.
Given that
Force = Pressure / Area
to increase the force you need to up the pressure OR decrease the area. We've already decreased the surface area as it is by lowering the AR so therefore increasing the pressure is the way its done.
I can't say for certain that what I have said is the way it is, But after reading the question I thought I'd try an answer using physics. Hope it helps
Cheers.

PS.(The best way to understand (Pressure = Force / Area) is to think of someone standing on your foot with flat soled shoes, and then doing it again with high-heels. ie:stilletos with a surface area of around 1cmx1cm sometimes
The force remains the same (the weight of the person) but with a smaller cross sectional area on the stilleto the pressure goes up (basic mathematics). And as you would expect being stood on with stilletos hurts more due to the greater pressure.)

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