vipertrunk

Okay, I have settled on some wheels and tires.

Konig Crosshairs 18 x 7.5 45O
Kumho ECSTA SPT 225/45/18 (hey, they were cheap...)

Question: I know the tire pressure for these tires will not be the same as what is listed on my current tire placard (32psi at all 4 corners). So, where can I find a recommended pressure conversion chart online? I have searched and Discount Tire Direct helpfully recommended "see your local tire store."

Now, before you answer - I have done a search of this forum and seen lots of opinions about tire pressure. I will tell you that I have always put 32psi in my tires - per manufacturer recommendation - and my tires have performed well and lasted a long time. If I were putting 215/50/17's back on this car...I would run 32psi.

So, in short, I'm not looking for the "track pressure," "drag strip pressure," "run your fronts 3psi higher because it's FWD pressure," or the "I run 40psi because I think it [add your opinion of what it does here] pressure." I'm looking for the industry standard "approved solution" for my tires.

I intend to run a chalk line across the tread for a few miles (till it wears off) to check for under/over inflation - but I'd like to find the "approved solution" online somewhere to be my starting point.

Thanks in advance.

smokendsm

iTrader: (1)

Yeah I would also like to know this. I have 235/45/17s on my 17x8s. (BFGoodrich g-force sport tires)

o1s

run the recommended pressure on the side of the tire.

cltypeSLOW

i run close to the max pressure for daily driving. i wanna make sure my lip stays safe

aznboi2424

iTrader: (10)

i would and i do run a few pounds shy of the max pressure listed on the tire.

easymoney

me too. ~47

SuperTrooper169

iTrader: (2)

^ Hmm, that high, huh? I run about 38-40 psi on my 225/45/18s. I checked around myself when I first got them and found nothing on recommended factory PSI, so I just put in a little more for ease of mind. I have zero problems with uneven wear.

Infact, here's the thread I started after I got them:

https://acurazine.com/forums/ramblings-12/whats-everybodys-ages-184225/

o1s

i run between 35-37 psi in mine. worried about my 9 year old lips.

vipertrunk

Apparently. I may have to go to the local tire place and say:
"Sorry sir, I didn't buy these from you - and I am not here to buy anything else - but can you tell me the proper pressure for these tires?"

I am certain that such a table exists, but I suspect - for liability purposes - nobody is willing to post it on the web. I'm sure if somebody used the "Tire-rack official tire pressure conversion chart" (if one existed) and subsequently had a blow-out the folks at Tire Rack would get sued.

I have to believe that based on the weight of the car and the weight distribution, a "correct" pressure for a given size tire can be calculated. It might vary somewhat between tires based on construction, but every tire has a "correct" pressure.

I may just have to look up the factory pressure for the A-SPEC TL's and approximate from there. I realize it's an 18 x 8, but it has to be close. The car is nearly the same weight as the CL.

o1s

man, you are analyzing this a little too much. run 35 psi. if you don't like the way it rides, put in or take out a little pressure until it suits your driving and comfort.

vipertrunk

I'm known to do that from time to time. But, tire pressure is important. Even a cheap set of tires can run $500 and I'd hate to eat them up early for something as easy as tire pressure. They get even more expensive if they fail.

Plus, with gas running $3/gal it can get expensive to run around with the wrong pressure.

easymoney

dude, check the tire wear every so often, its really not that difficult