Hi Sean,
Cold tire inflation is for "cold that day". Just as long as it is before you have driven the rig. So indeed, if it is 39 degrees out, you will have to add air if the last time you checked them was this summer and "cold" was 80 degrees.
VERY ROUGHLY figure 1 PSI/ 10 degrees F.
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1976 Newell Classic (Sold)
Home Base: Riverside, CA
If anyone needs my contact info private message me and I will send it to you.
-Joseph-
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