Tire Pressure Vs. Ambient
I recently found that adjusting our tires to the cold inflation temperature base on the local ambient may not be the correct way to do this. Based on this info, the ambient temp for setting tire pres...
Forum Discussion
The point I think is really this; instructions are to check psi "cold". Well, define cold. Since everyone on this forum (unless we are next door) has a different ambient temperature, cold is relative. For the purposes of documentation, cold is defined by tire manufacturers as a static value of 65. I won't guess why they picked 65 but that's what it is. The chart was talking about a moving scale. So 85 PSI at 65 deg F would follow a curve to more PSI the higher the ambient temp. This is not new science it's just a relative curve based on a static temp vs real world variant temp. In the grand scheme of things, tires are designed to run on a wide range of temps and PSI safely (because of variant factors). So , this is all a lot of air.
