As well as tyre size, tyre pressure depends on weight of the car, weight of
the load you're carrying, road speed you're mostly gonna be doing and your
If you're gonna howl around twisty lanes at mach 3 then you need higher
pressures. If you're gonna tootle around to the local shops then you want
the pressures lower.
Keep an eye on the treads, if they wear more in the middle of the tyre then
lower the pressure, if they wear more on the inner and outer edges then
increase the pressures.
Hope this helps.
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