Cold vs. hot tire pressure
Now having dashboard readout of individual tire pressure has made me aware of quite a difference between cold and hot. Carrying a heavy camper, I have Nitto Dura Grapplers 285/75-17 and run 70 psi ...
Forum Discussion
CapriRacer wrote:
I think you'll find that the table is marked "Maximum Load" for a given pressure. That is not a recommendation.
I also think you'll find the vehicle manufacturer has a specification for tire pressure listed on a placard usually located on the driver's doorpost.
This is essentially what I posted. You determine the weight the tire is carrying and then look at the inflation table to see what pressure the manufacturer requires (recommends, just a choice of words), to inflate the tire.
Yes, the drivers door placard does give the required inflation pressure, but this given pressure is only valid if you carry the maximum load (RGAWR), which is also stated on the placard.
The dually in my sig has E rated tires, whic are rated at 3042 lbs at 80 psi. But the door placard gives 65 psi inflation for a maximum rear load of 9350 lbs (RGAWR).
If I stay within the weight limits why would I ever want to inflate to 80 psi in the rear tires? Even if I ignored the GVWR and loaded up to the axel rating I still would not need 80 psi.
The old myth of setting them at 80 and forgetting it, as stated many times on the forum, just doesn't make much sense to me.
ryoung
