Tyre pressures - a different twist

Submitted: Thursday, Apr 21, 2005 at 21:59
ThreadID: 22271 Views:3284 Replies:6 FollowUps:8
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Hi all

Read a lot and had a fair bit of experience in experimenting with tyre pressures, but have a topic for debate.

At what temperature should we be taking the reading? I know that generically we take the temp. when tyres are cold, but what is cold?

I inflated both my front tyres to the exact same pressures the other day, and they were still exactly the same when I later tested them at a particular time. But at night when the ground is cold they measured 1.5 psi less than in the middle of the day before. The car had not been driven for hours prior.

And to add another twist, in the morning I got up and tested them, one of the tyres was in the shade and measured exactly 1 psi less than the other front one which was in slight sun.

So to make sure we get an accurate tyre pressure each tyre must be at the same temperature, this is almost impossible because the sun does not shine on each one at once.

And when we say we inflate our tyres to say 32 psi, that may well only equate to 30 psi if the temp. drops significantly overnight.

Not that I really care, but just thought I'd throw it up for discussion.
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