Tire Pressure
Senior User
Joined: Mar 2001
Posts: 379
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The reccomendation on the door tag will actually be a bit higher than needed. Bigger tire tend to be able to support more weight given the same aire pressure. Drop a couple of pounds off and that should get you pretty close.
If you want exact go to the Off Road forum and look in the "Bogger or TSL" post. I typed up the formula for finding proper tire pressure in there. Here it is in short:
1/2 GVWR(front or rear) / max weight (on tire)= .xx
.xx * max pressure (on tire)= propper pressure.
If you want exact go to the Off Road forum and look in the "Bogger or TSL" post. I typed up the formula for finding proper tire pressure in there. Here it is in short:
1/2 GVWR(front or rear) / max weight (on tire)= .xx
.xx * max pressure (on tire)= propper pressure.
Senior User
Joined: Nov 2003
Posts: 172
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Given the above answer, is there any difference in tire pressure needed between a passenger tire and a light truck tire, if both are the same size--P235/75R vs. LT 235/75R?
The decal on my 1988 Ford F150 supercab recommends 35 front and 41 rear for the passenger tires--does that still apply now that I have light truck tires on? If I am mainly driving with the box empty, should the tire pressure be decreased a bit--I am assuming that the 35/41 is to accommodate hauling, etc.
Thanks for any information.
Frank.
The decal on my 1988 Ford F150 supercab recommends 35 front and 41 rear for the passenger tires--does that still apply now that I have light truck tires on? If I am mainly driving with the box empty, should the tire pressure be decreased a bit--I am assuming that the 35/41 is to accommodate hauling, etc.
Thanks for any information.
Frank.
Senior User
Joined: Mar 2001
Posts: 379
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That 41 psi in the rear is what is needed to support maximum payload in the rear of the truck w/ the stock tires.
I believe LT tires have a higher load rating and can support more weight than the equivilent P-Metric tire.
If you frequently drive w/ little to no weight in the rear there is no problem w/ lowering the tire pressure in the back. You just have to remember that if you need to load up something really heavy, the tires will need to be aired up again.
I believe LT tires have a higher load rating and can support more weight than the equivilent P-Metric tire.
If you frequently drive w/ little to no weight in the rear there is no problem w/ lowering the tire pressure in the back. You just have to remember that if you need to load up something really heavy, the tires will need to be aired up again.
