Originally Posted by CaptainJohn
I just purchased a Flagstaff VLite with Nitrogen filled tires. When I checked the tire pressure it was 40lbs in all 4 tires. The sticker on the trailer says the cold tire pressure is 50lbs. I checked them in the morning around 9:00AM and the outside temp was 50 degrees. I
don't have any experience with Nitrogen filled tires. Would the above indicate that all 4 tires are low?? Any thoughts are appreciated.
To little information to yudge.
First we have to know what pressure the tires need to laws of nature, so they dont damage by overheating when driving maximum speed you use and wont go over for even a minute.
The 50 psi can be a standard setting because "maximum"pressure of OEM tires.
Many trailer- and Motorhome-makers ( are we talking about trailer here?) are not tire-specialists and base their advice on general information, so for instance always "maximum"pressure.
I am able to calculate a save lowest pressure and one that gives maximum reserve but no bumping . But need more data of tires and vehicle.
Nitrogen filling is by the production process free of water( as gas) and water can make the pressurechanche by temperature chanche in tire more unpredictible.
Also the tire loosser lesser presssure in time , but effect is often exagerated by 4 times as slow , but in real a smaal 2 times , but only in the beginning.
If wanted I can copy a document I made about that filling with normal air with the water as humidity in it is even better then filling with Nitrogen.
Will give a picture about pressure chanche by temp chanche in wich assumed cold filling is for 18 degr C/65 degr F but others write 20 degr C/ 68 degr F.
Then look the 40 psi back in this list at the 50 degr F you measured it, and see what it would get at normal temp.
This list assumes zero % water in tire and no expantion or schrinking of tire by the pressure chanche. In normal conditions these effects will be marginal.