The car didn't feel right going down the road, it seemed like the wheels had gone out of balance. The tires looked OK but I checked the pressure anyway. They were all down 5-10 lbs. There had been a sudden 15* temp drop recently and I think that's what caused the situation. The Festy is so light that the drop in tire air pressure didn't change the look of them much.
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Here in Ottawa the temperature ranges between 30C in summer and -20C in winter and the pressure does not change by more than 2lb. I'd say you both have other issues.Original owner of silver grey carburetted 1989 Festiva. 105k km as of June 2006. 140k km as of June 2021.
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Here's an article from Tire Rack:
From the article:
"The rule of thumb is for every 10° Fahrenheit change in air temperature, your tire's inflation pressure will change by about 1 psi (up with higher temperatures and down with lower).
In most parts of North America, the difference between average summer and winter temperatures is about -50° Fahrenheit...which results in a potential loss of about 5 psi as winter's temperatures set in. And a 5 psi loss is enough to sacrifice handling, traction, and durability!"
Tire volume from small to large tires may have an effect as well.
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