hurstrescue

Does anyone know an easy way to calculate the correct tire pressure for replacement tires?

My door sticker says 35 psi ( I think) for 225/65 16 tires. I have replaced the originals with 265/75 16 tires. The tire lists a max pressure, but not a normal pressure.

How to I calculate the correct pressure?

Thanks,

Joe

usmcdoc14

there is not "simple" math as there are too many variables in tire/belts/whatever. Do a "chalk test"

1 piece of chalk, the kiddy sidewalk kind works well
a tire pressure gauge
a big parking lot with no cars and a nice strait run of say 500 feet

Drive around a bit to get the tires nice and warm and flexible.
get to one end of parking lot
aim vehicle across with the wheels strait
rub chalk across the entire tread of all 4 tires in a nice width as so you can find it.
drive forward, NO STEERING, for 500' or so.
stop
look at the chalk.
You will notice (almost 100% of the time the first time out) that the "center of the tread will have no chalk and the outers will.
deflate 5-10 psi
repeat until almost all the tread is wearing evenly.

My 35's are running 28psi all the way around and are quite happy