I know that you have to set tyre pressures when the tyre is cold (i.e. when the car hasn't been driven for at least six hours.)

But what if you come out in the morning and the sun has been blazing away already and you physically feel that the tyres are already quite warm.

Is it stupid to set the pressures then because the sun's heat will distort a correct pressure reading?

 

Yes

You can check this by taking a reading on the tyres that have been in the sun, then compare that with the ones in the shade - they will be different.

Justin

 

Thanks

 

Jay is correct. I hill climb my Scooby and tyre pressures are very important. Shade side to sunny side so to speak can see a real 5 psi difference. Not too important on the road but murder on a track!
Graham.

 

To the track have your tyres with nitrogen! It's much more stable.

 

I set my car's tyre pressure in the morning but when the weather is cold in the morning, suspension gets stiff and affects car's ride during the rest of the day.

Can anybody comment on this?

 

are you sure? My STi has all nylon bushes and tons of mods, and in the 'cold' creaks a lot, but is silent after a few road miles with no change in ride quality at all. Maybe its the gas in the dampers?