i've always ran any tire ive ever had at 32psi:shrug:

 

35 here

 

i run my 245/30-22s at 45psi nitrogen. when i had 255/45r18s i ran 32psi and it ride fine and wore great IMO

 

where do you go to fill up with nitrogen?

 

alot of aftermarket rim shops can do it, shit costs like $30. when i traded my SS wheels for these, notsosane had them filled with nitrogen. i still check then periodicly just to be safe.

 

I run my Goodyear Eagle F1s at 40psi, max psi is 44 thats whats on the tire!

 

yea most are 44psi max, i tink mine are 55psi max.

 

word the front seem fine but i am def gonna take 2 psi out of the back when i hit bumps in the road my truck feels like its hoppin a bit in the back due to bein lighter in the rear..

 

Jesus guys, you're burning the tires from the middle out. >.<

32-34 psi is where mine live. Lower and they roll, higher and they bubble out the centers.

 

ya i just put 34 in this weekend nice ride i am keepin em there 36 psi and my truck was air born over bumps

 

Great thread, I wanted to post one like it but didn't.

I have 235/40/18 Sumitomos and the max psi rating is 55psi. I filled them up to 45psi but was wondering on others takes.

 

my rule oif thumb is to go by what GM put on the inside of the door... cause lets face it some jack ass at a tire store has done fuck all but sell a tire while i expect that GM has some reason possibly even did some testing to come up with that magical number so why not put a little fayth in the people that designed our trucks?. that being said i do run a Xterrain so mine goes as low as 10psi or as high as 45.... but for street use i usually have it at the reccomended psi from gm,.,., cant remember what it is i just read off my door when i air up

 

that recommend PSI from gm is for a stock size tire though so ya cant go by that if you change the tire size.. the tire pressure has a couple determing factor such as weight of vehicle.. type of tire and size , if your towing something, and just personal preference of how you want it to handle.. generally the smaller the side wall the more pressure you need to protect the rim from bein bent.. also if you have a wide tire you need more volume of air which means ur going to need more pressure in there... like a big mudder tire would require less pressure cause it has a big side wall more support vs a low pro tire which is alot less forgiving..

 

My truck didn't come with 235/40s though lol

 

i dont see why PSI should matter on tire size... ive run 33's on the same PSI as 305/75r15 camaro vs truck.... just start with GM's number and than adjust to your taste... tire makers and sellers dont know the exact weight or anything about our vehicles.. so how can they tell you its too much or not enough.

 

im not in any way trying to start an arguement but PSI is PSI the PSI shouldnt change depending on volume it has nothing at all to do with volume. and my big mudders actually ran at a higher PSI than my low pros on the maro because it took more pressure to keep the correct shape for equal tire wear. once at the trail we would air them down for off road traction but on road it was around 55psi or more at times. i agree that type of tire makes a difference especially if your switch between biasplys, radial, dual compound etc. i under stand why you would want a higher pressure when running super low pros so that the tire does not compress as easily. but i still say that the factory recomended is still the best place to start because gm has taken all pieces of the equation into acoount like weight, wheel base, etc. wether you go higher or lower is personal but its still the best place to start.

 

most tires of lower profile are stiffer rubber and require higher pressures

 

Camaro SS 20's call for 36 in the book.

Those are 245/45-20 and 275/40-20 tires.

Wanna know what people are running them at?

Long story short, over 40 PSI in ANY 4 wheeled passenger vehicle tire is rediculous.

 

how about you look on the side of the tire and see what psi it tells you to run them at?

Also if you are in a 15 passenger van the tires should be ran at 80 psi. Running them at a lower psi can cause catastrophic failure.

Another pointer: when driving, if you have a blowout, tread release, etc. on a tire accelerate, get the vehicle under control and drive until it is safe to start slowing down and pulling off to the side of the road. NEVER HIT YOUR BRAKES WHEN YOU HAVE A BLOWOUT OR IT COULD AND ALMOST ALWAYS WILL CAUSE YOU TO LOSE CONTROL

 

how about you look on the side of the tire and see what psi it tells you to run them at?

Why don't you look at that... and you'll see, the ONLY marking on the tire is MAX PSI.

Max is NOT the same as recommended.

 

cause it does not tell you what pressure to run em at on the side wall just MAX pressure which you should not run..

sorry sol86gt didnt see ur post

 

yes and generally you are supposed to run __ below max I know it doesn't tell you the psi you are supposed to run duh.

Also the sticker on the inside of your door DOES tell you

 

ya thats for a stock tire size 225/75/15 so if you get low pros you cant go by that number.... which is why i made this thread to begin with cause bmw recommends 36psi in a 245/45/18.. which is 6 psi more than a stock tire size...

 

Let me also add that this is exactly why some tire sales places won't sell you tires that aren't "load rated" for you vehicle. Tires that aren't load rated can be subject to catastrophic failure.

 

In all of the tires I have owned or sold, I put the pressure at 5psi under max. You also have to remember that tires heat up when driving and the pressure increases, that is why you do not fill to max. If you buy new tires, don't always look at the pressure listed on the door. Check the tires first. You could have had a stock tire with the max of 35p.s.i. and just bought a tire at a max of 44p.s.i. And in instances like alot of you with liftd trucks, you may have gotten a A/T that was an LT rated tire which will have an 80p.s.i. max. Check your tires, not your doors, use your descretion.

 

I run what the door says. I did on all of my vehicles, lifted and lowered and never had a problem.