Hi,
I was told that should you check the tire pressure, and it is say 68 PSI in the campground, you drive down the road to get gas and now it is reading 74 PSI, you should still add 12 PSI to that reading, so that the next time the tires are cool, they will be at 80 PSI.
Your pressure reading is 125 Minimum to meet the maximum load. If you are not loading the tires to the maximum weight rating, you can run lower cold tire pressure Ambient temperature can change the tire pressure a lot. Altitude will not change it much at all, because it is starting well above 100 PSI. Your "Absolute" pressure is actully about 15 PSI more than the reading at sea level, while in space the pressure would increase by 15PSI above what it was at ground level. However warming the tires from 40F to 120 F will increase the pressure a LOT!
Keep it close to the 125 cold pressure. 110 might be fine if your tires are not near their maximum weight on them.130 PSI is also fine, if the rim is rated at 130 PSI cold too.
Fred.
