Check Your Psi!!!

i may be the only goof who messed this up, but for the longest time, i've been running at 33 PSI on my Kumho Ecstas! No wonder i kept having to get gas every week or so! the tire says 50 PSI!!!

make sure you are at or near the suggested tire manufacture's pressure, especially with the rise in gas prices and change in weather! gonna be in the 90's here in A.C. this weekend!!!

ur the man .. i check mine once a week .. its gunna b in the 90'z here in qnz also .. im at the beach with the ladies .. hehehehe

Wait... I thought you were supposed to go by the door placard, not the max psi on the tire???

By the tire yo. Those on the door card are for the tires the manufacture put on there. If you are still running the stock tires, then yes, follow the card, if not, follow the tire.

wow. ok, i figured the placard was for any tire that was of OEM size, stock or optional upgrade. thats something they don't teach you in auto school/ASE.

I don't know what they teach in auto school.

Just seems like common sense to me.

I cannot say 100% that is how it is, but it seems like that is the way it should be.

Aaaaaah see, now you're just going by what you think is common knowledge. Are you sure you're not reading the "max tire pressure" rating? That's the max amount your tire should hold, not an everyday value.... I went to school to be an auto tech (ase cert. In brakes, steering, and suspensions) and I thought this whole thread was backwards when I 1st read it...

Then I started thinking...

Almost every car ive seen/driven has a tire pressure rating of between 28-35 psi. I can't recall seeing anything higher than that. Ill guarantee that if you keep driving with that crazy tire pressure that your tires are gonna bubble in the sidewall from pot holes (if not burst) & the tires will wear unevenly in the center. 60 psi is not safe to drive on. Period. Especially in bad weather, when contact patch is needed most.

The placard may be there as a recommended psi reminder, but regardless of what brand of tire I doubt that anyone will tell you to pump your tires to 60 psi. Try calling different tire manufacturers and asking the sales reps. See what their take is on this situation.

I completely disagree with this theory.

On that note, I have sumitomo tires, and max pressure is 51 psi, but I wouldn't ever inflate them to that.

why would they tell you the max is xPSI if you run the risk of (frankly) killing yourself and possibly others? if the tire company puts xPSI on the tire, im sure they've tested it at that PSI under various conditions. that's a lawsuit waiting to happen if they say you can inflate to xPSI and you blowout cuz of it!

the sticker on the inside im sure is for the stock tires...

every tire is constructed a little different with different speed ratings, strength, contact patch design, etc. so why would all their PSI's be the same?

i do agree, however, to your last point, Graphite - to fall a little short of the suggested max pressure. my tires recommended max is 50 PSI. i stopped at about 46. that's a big difference from the 33 i was running and it showed in my gas mileage!

i understand where you're coming from, but i think it also goes for stock-sized tires as well.

i'll make some calls and send out a few emails to get to the bottom of this. now i'm irritated because there are too many valid points to rule anything out.

as for me, i'll stick with 29-32 psi.

I am with TBITB, I usually go with 4 or 5 below the PSI. Also too I think I read somewhere you can go over like 5 or 10 PSI before you really have worry about anything.

yea i thought you may be able to go over the recommended max psi a little. i figured there has to be a 10 psi window. but i wouldnt go over. i'd hate to bust a tire especially in this hot weather!

Im riding on the stock tires that came with the car, 40 PSI in fron 38 in the back, and im getting about 4-5 extra MPG!!!!

thats what i said. no one believes me lol

i agree .. it also reduces wheel hop wen taking off from the line .. the more air in the tire the bouncier it is (obviously)

the 50 psi is the max rating. you do not want to put this much air in your tire.
tire pressure's differ from vehicle to vehicle because of how heavy the car is.

you should always go with what the manufacturer says for the vehicle. it doesn't matter what kind of tire you ride on. go by the factory recommended tire pressure.

ideally, you want even pressure across the whole tread. which is why you want to listen to what scion says for tire pressure.

or you can do what you want and a few months down the road, have uneven tread.

Goodyear Tires | Support | FAQs | Proper Inflation

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lol lol
yep-yep
sure are

I run with it about 28psi in my tires. I like having a little more traction.

and with that comes a decrease in mpg and sluggish handling....