Tyre Pressures - Winter vs Summer

Technical Area Wheels, Tyres & Brakes
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  1. My model of MX-5 is: __ND3
  2. I’m based near: __Jupiter
  3. I’m looking for technical help or recommendations on: __

So in the winter I had my tyre pressures set to 29psi cold, and they didn’t get above 30-31psi after some spirited driving.

Now we are having some warm(ish) weather, I’ve noticed they climbed up to 34-35psi after a drive, or even 32-33 sitting in the sun. So have let them down to 29psi when warm/hot, as climbing to 33psi or more makes for a bumpy ride.

I understand they will be 27psi or less when cold and will add air them when the weather gets cooler. Any thoughts?

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Don’t touch them, naturally the temp will get higher driving in summer, we’d be forever reaching for the tyre inflators when it fluctuates.

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Just as a side issue, I suppose you should check your pressures early morning if your car is in the sun as if you’re side-on to the sun, one side is going to be appreciably hotter than the other so “cold” pressure will be higher. .

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So I should drive with the higher pressures with reduced ride comfort? Nah I have a tyre inflator handy, I’ll drop the pressures!

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We need a tyre expert on this🤔

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Cold pressures are cold pressures. This allows for warming up - at which point the tyre must be at its optimum profile. 31 or 32 psi, who knows?
I don’t get the logic of dropping hot tyres down to 29 psi. They must then be under inflated.