carrotjuice

Hey Guys,

I have a 91 4Runner and noticed that my tires were really out of air. I looked in the forums and took the suggestion of looking at the side door where the VIN is to find the tire pressure.

Unfortunately, I found out the tire pressure specs are only for P225 Tires. I currently have P235 Tires, so I'm not sure what tire pressure I should inflat it as.

Any suggestions / tips?

Thanks everyone!

ozziesironmanoffroad

*edit* sorry. 91 runner? what size tires? what brand, size, a/t, m/t, etc?

colsoncj

on the side of the tire it should have the max psi on it. run less than that.

my guess, assuming they are normal street tires designed for a max pressure of 35 psi, id say somewhere around 32 in the front and with no weight on the back 30ish in the rear.

notanymore

i run 30-35 in my truck, i dont see why the street psi should change just because the tires are a little taller.

CJM

Chalk test:

Air up to about 10lbs less than the max pressure. Put a line with chalk ACROSS tread, drive 50-100 feet and get out and check for even wear. Remove or add air till the chalk evenly wears away.

colsoncj

Nice trick!

I can tell on mine by looking, but thats a good way for everyone!

CJM

Everytime someone posts a thread like this I say it 10x but thus far not a soul listens but you.

Everyone always says: "well I got those size tires on my X and I run 35 psi all around" or "I run what the door jamb says"

That stuff dont work unless you use the factory sized highway tires that the truck comes with from the showroom. My test is accurate!

colsoncj

lol.... search button...

and even with factory sized tires, they may be a different load rating, sidewall stiffness, etc that would affect load dispersion leading to a need for a deviation in pressure. agreed the chalk test is a good method, should give you surefire results.