80 PSI on Aluminum Wheels
I'm running 225/75/15 D rated tires on aluminum rims inflated to 65 psi. The only GY Endurance tires I find this size are E rated inflated to 80 psi. I do not know anything about these rims other than...
Forum Discussion
ktmrfs wrote:You say that, but don't support it by providing any detail on what tires were spec'd as OE. You don't provide the manufacturer's axle ratings. The whole post was a jumble of numbers which don't support the conclusion.
nope, the front pressure has a load capacity above front axle rating.
I found a GM placard which matches your 10,000 GVWR.
1996 Silverado 3500
GVWR 10000
GAWR(F) 4250
GAWR(R) 7500
Tires
LT225/75R16D 60 PSI (front)
LT225/75R16D 55 PSI (rear, dual)
Inflation/load table for LT225/75R16D
55/2060
60/2190
65/2335
So, to support a GAWR(F) of 4250, you need 4250/2=2125 per tire. 55 psi isn't enough, 60 psi is.
For the rear, duals get derated by dividing by 1.1 (roughly, the numbers below come from the actual tables), making it:
55/1875
60/1995
65/2150
GAWR(R) of 7500 needs 7500/4=1875 per tire. That requires 55 psi.
Not coincidentally, the placard matches the pressures indicated by the tables exactly. Manufacturers sometimes interpolate the numbers and come up with numbers like 58 psi.
