Quote:
Originally Posted by Suberman
Same as for summer tires. If you fit XL spec then they can take a pound or two less because the sidewall is tougher. More important is to keep adding air as the temperature drops to maintain correct pressure.
Add 1 psi over spec to compensate for each 5C you expect the temperature to drop from the temperature at which you measure pressure. In a heated garage driving immediately into zero C you need to have 37 psi as measured in the garage to ensure you have 35 psi while parked at Safeway. In Canada this means your tires will be over pressure for most of the winter to ensure they are to spec early in the morning.
Remember to adjust downwards as ambient temperatures rise towards spring.
Here in Calgary this game gets monotonous quickly as we have spring regularly, tomorrow eg all my cars will have 4 psi too much in their tires by noon and back to spec by sundown.
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I think you are being a bit overzealous. 4 psi will not likely change much. I used to drive an ambulance and with the sirens on I always drove the speed limit, while other colleagues drove considerably faster. I have never had a patient die because I drove slower. The same will be true with your tire pressure, you aren't going to crash because you have 10% different tire pressure as long as you are not trying to be an 11/10ths rally driver.