Tire Pressure

Im getting some 20" wheels and staying with a 35 tire. What psi are yall running these tires?

Tire/Wheel size is really irrelevant. For on road use stick to what it says in the door frame... 44psi. Its more of a payload thing.

I'm not sure the size is all that relevant but different tires will act differently at the same psi.

Man, I don't know about you guys but I can't stand running my mt/r's at 44 psi. Way too hard (although at my age, I'm beginning to appreciate something that can stay hard). Low 30's is perfect for me. YMMV.

Madcow, I just stared at you sig pic for like 5 minutes lol. Man thats cool !

For stock tires what will show wear evenly for street use? I tried 50 and was way to hard. 45psi feels better i'll try 40 today

as stated above, unless it goes against what the tire manufacturer states, you want to stay around 44psi +/- 5psi. With aftermarket tires, it's a balancing act between ride quality and pay attention to how they are wearing. if you need to adjust a few psi for either reason then you may do so. you could also email the manufacturer and ask them what they recommend.

Actually tire size does mater, most people think the bigger the tire the more PSI needed but its the opposite. When I put bigger tires on my Jeep years ago 31x10.5/15 the guy at the tire store said Ill pump these up to 50 PSI because bigger tires need more air. The ride was horrible. I did some reading and found out that larger tires need less PSI and those tires actually worked best with 28 PSI.

justvettn said:

Actually tire size does mater, most people think the bigger the tire the more PSI needed but its the opposite. When I put bigger tires on my Jeep years ago 31x10.5/15 the guy at the tire store said Ill pump these up to 50 PSI because bigger tires need more air. The ride was horrible. I did some reading and found out that larger tires need less PSI and those tires actually worked best with 28 PSI.

Click to expand...

LOL that guy was half right. While technically a bigger tire does need more air, it doesn't mean they need a higher psi.

Ok---I will be nice but to the OP be wary of well meaning people who are not knowledgeable about tires. It can damage your vehicle due to a catastrophic failure or get someone killed in an accident. Once you depart from the standard tire size and load rating that came with the vehicle what is on the door means squat.

In short running lower air pressures and this is dynamic and is directly proportionate to the load rating of the tire for example 5psi lower operating pressure on a E rated tire is a lot different than 5 psi on a C range tire all conditions being equal. There are way too many variable here but in short the bottom line is this. By running less than the psi cold on the sidewall you are not necessarily doing anything wrong. Where you get into problems is by running lower (How Much Is The Question) pressure for ride comfort then the carcass which bears the load is flexed differently than when the tire is properly inflated. We are not talking about off roading lol but on the pavement. As the tire heat cycles and degrades over time then there is a much higher probability that you will experience a catastrophic failure of the tire.

Also as a side note tire AP is directly related to your mpg’s.