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Correct me if I'm wrong, but is not the pressure on the label to meet the GAWR (axle weight rating)? Combined axle weights will usually exceed GVWR.
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I'm not the expert on this stuff. Maybe we can get toalpi to chime in with the straight scoop. /ubbthreads/images/graemlins/cool.gif
But here's my take:
You're probably right. /ubbthreads/images/graemlins/warmsmile.gif
Use my pickup as an example.
Front GAWR 4,850
Rear GAWR 4,970
Combined GAWR = 9,820
Ford says 60 PSI front and rear. For my stock tires, 60 PSI results in 2,485 pounds capacity per tire, or max of 4,970 per axle. 4,970 is the same as the rear GAWR and slightly more than the front GAWR. But 55 PSI is a tire capacity less than the front GAWR. So it has to be 60 when loaded to the GAWR. /ubbthreads/images/graemlins/grin.gif
But on a practical note, when I'm overloaded to 9,620 GVW and 15,960 GCW, my front axle carries 4,440 pounds and the rear is 5,180. So I'm nowhere near the GAWR on the front axle, but overloaded on the rear axle. That's why 60 PSI in the rear tires is not enough for my rig when loaded for bear. /ubbthreads/images/graemlins/blush.gif (And if those numbers look funny to most of you, remember that I have a 4x2 with around 400 pounds less road-hugging weight on my front end. /ubbthreads/images/graemlins/cool.gif )