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Noob tire question

A

AVAFREAK182

Banned
I have 2 sets of tires on my car (fronts are Michellin, back are Toyo).

They say max 44 PSI but that seems high to me.

One is like 38, one is 37, and 2 are 36.

I'm thinking they need changed, but how much to go in each? Or do i need to know more?

Thanks
 
Open the drivers door, there is a card stamped somewhere on the door frame detailing tire pressures. Also, the owners manual will tell you this if you look correctly. You could also tell us what this car is.
 
My Chilton said look in the glove box for a chart (I don't see one) and on the drivers side door pillar (which idk wtf that is, but I looked around the door and didnt see anything)
 
Maximum on the tire is not related to the vehicle recommendation and is likely too high. You're pretty safe going with 35psi for any typical vehicle.
 
Or you could google it.

30-34 would probably be a better range. Most passenger cars hover around the 32 mark, some below, some above. Too high and you'll wear out the inner tread of your tires faster.
 
After reading my entire manual there was one TINY part that said it's in the center console.

It says 29 PSI. Does that sound low? And the air in them is wayyy to high.
 
AVAFREAK182 said:
My Chilton said look in the glove box for a chart (I don't see one) and on the drivers side door pillar (which idk wtf that is, but I looked around the door and didnt see anything)
Click to expand...

open the door, the pillar is the part opposite the hinge. should be a big white-ish label on there. it'd be about where your right thigh is just after opening the door.
 
Can someone explain "cold". I'm sorry I'm literally an absolute noob.

And can my fuel economy actually go UP letting ~10 psi out of each tire?
 
AVAFREAK182 said:
Can someone explain "cold". I'm sorry I'm literally an absolute noob.

And can my fuel economy actually go UP letting ~10 psi out of each tire?
Click to expand...

Cold as in not having driven the car for a couple hours, and not having the tires being baked by the sun. When you drive the car the tire pressure in the tires will increase by several degrees just due to heat. Now, if you try and correct the pressure here you'll end up with tires that are not inflated enough.
 
Demo24 said:
Cold as in not having driven the car for a couple hours, and not having the tires being baked by the sun. When you drive the car the tire pressure in the tires will increase by several degrees just due to heat. Now, if you try and correct the pressure here you'll end up with tires that are not inflated enough.
Click to expand...

OK well I need to release air so this "cold" thing shouldn't be too big an issue.

When should I deflate them? It's about 35 in the mornings here and ~55 in the afternoon.

Also, any answers on the fuel economy with lowering my PSI?
 
AVAFREAK182 said:
Can someone explain "cold". I'm sorry I'm literally an absolute noob.

And can my fuel economy actually go UP letting ~10 psi out of each tire?
Click to expand...

Cold means you've haven't driven on the tires for a while. In the morning is the best time to check them. Increasing tire pressure to a point will increase mileage. Trying riding a bicycle with almost flat tires, and see if it takes less effort than the same bike with properly inflated tires.
 
forgive me if i'm wrong, but doesn't the door pillar/manual suggested pressure only apply to the OEM tires? Since i assume these are aftermarket, won't they have their own suggested pressure value? new to cars, but that's how i've come to understand it.
 
archetypaul said:
forgive me if i'm wrong, but doesn't the door pillar/manual suggested pressure only apply to the OEM tires? Since i assume these are aftermarket, won't they have their own suggested pressure value? new to cars, but that's how i've come to understand it.
Click to expand...

No.

This is easy:

If you are using OEM rims or wheels with suggested tire size, then use those values. Similarly, if you are using aftermarket rims or tires with similar dimensions, then you can use those values as well.

If you are NOT using OEM rims or tires, then the PSI ratings are not nearly as useful. 30 PSI is a fairly safe number to start with. You can experiment with what you feel is a good balance between traction and fuel economy by increasing and decreasing the PSI from there. They are inversely related (obviously). You do not want your tires to look flat but they definitely should not look michelin man round.
 
Loiusssss sais "INFLATE TO SIDEWALL AND REAP THE SAVINGS!!!"

He's not even here anymore. Let's not call him out in absentia.

Zenmervolt - AnandTech Moderator
 
Last edited by a moderator:
if you're high on the pressure, you get better gas mileage, inferior traction, and decreased ride comfort.

If you're low, you get better traction and ride comfort, and worse mileage.

If you're too far on either end of the scale, you might bounce around the freeway, or ruin your tires.

I have the tire guys at Sam's club put them at 29 when I get them rotated.
 
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