Let's have a conversation about inflation...

[red/green hawk]

The math way is the answer for everybody.

So, Yokohama notes on their site, E rating is 80psi max psi, their 121 load rating you also noted in your original post is 3,197lbs.

So, math.

3197 x 4 = 12,788lbs is the max weight 4 of these tires can support.

Ok, I need your truck weight, but I don't have it, so I'm going to use a generic 5500lbs.

Your 5500lbs truck weight divided into the 12,788lb max weight = .4301

That means that your 5500lb truck is 43.01% of the total max weight that can be supported by those tires.

So, we take that 43.01% and we multiply it by the tires max psi of 80psi and get 34.407psi

So 34.407 is the psi for the 5500lb truck, add weight and it'll need more, take away weight and it'll need less.

Outside of that, you're just doing you, that's the math of it.

For on road normal driving, that'll be the minimum number you want, because at less psi the tires aren't geared for your weight, so you'll want to go more, if anything. But remember, high pressure can lead to blow outs, loss of traction, uneven wear and so on as well, it isn't just the "easy" button.

Again, lawyers will have built safety margins into those tire numbers as well, so we don't need to be pedantic about it, but nonetheless, that's the minimum safe tire pressure for normal on road driving.


That works for everyone. Do the math for your tires and vehicle, it WILL work for you.

Yokohama recommended you 35, I don't know if you gave them a weight of 5500lbs for your truck, or if they just looked up Gladiators and used that, but the math I just did is right there with them...

Then, people can get into what makes them feel good, thumb test, chalk test, traction test, heat test, and so on... to adjust further to how they WANT, what gives them the good feelies.

But the need can be determined by math, and your chalk test should actually show quite great results at the mathematical psi, I've never had it test bad.

5500 is a good guess. I weighed at Cat Scale and it came in at 5520 lbs. Minus the weight of my son and daughter and accounting for half a tank of gas I'll calculate the weight of my truck including myself at about 5400 lbs.

Sponsored