Originally Posted by schrederman
The word "cold" should actually translated to ambient. Summer temps here in the early morning are about 80 degrees... If I go on a trip in summer, I start with my tires at max sidewall pressure that morning at 80. In winter, it may be 42... So, if I go on a trip in winter, again, it's max sidewall pressure at 42. Don't read too much into it...
You need to inflate your tires to the temperature of the season. If the average temperature is 30 degrees in winter, then inflate when you have cold tires and the outside temperature is around 30. If the summer temperature average is 80 degrees, then figure that is the time to inflate.
The general rule of thumb is for every 10 degrees in temperature fluctuation, there is a 2% fluctuation of air pressure. When I see my tires running at 54 degress of pressure on by TPMS after filling up at 50 psi, I figure they have heated up about 40 degrees.
I don't do a lot of cold weather traveling, but I still add air to my tires when it gets cold to stop the confounded TMPS alert quiet.
Chap , DW Joy, and Fur Baby Sango
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