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Unread 04-24-2015, 02:47 AM   #1
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Default question for folks with good understanding of tire wear/tire pressurization

Hi folks, long story short as possible, i bought a used chevy cruze 2011 that i use for private hire taxi work, i was having trouble getting the alignment done properly for a good 10 thousand miles and during that time all 4 of my tires got some uneven wear on them with back to front rotations i finally got the alignment done properly with the hunter hawk eyes system.

But i still have a few tire issues that i was wanting cleared up.

When tires are unevenly worn, do they fill up differently when putting air into them ?

My tires are meant to be set to 39 psi according to the sticker on the door and whenever i put air into my tires usually once a week, the car feels horrible to drive for the first day or two.

It bounces about up and down, feels uneven when driving and with the uneven wear pulls a lot with bumps on the road etc... but once i've let the car sit over night and drive it the next day it drives great and continues to drive great until the next time i need to put air back into them.

So basically do tires that are unevely worn fill up unevenly ? and when left to settle overnight even out ? the psi doesnt change over the week yet the drive improves so it can't be air loss more that it is being distributed elsewhere in the tire ?

I know i should get all four changed but since they are still nearly new i was going to run them down then replace all four with an alignment when the time comes.

the tires are 17 inch low profile ones that come standard with the car.

thanks

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Unread 04-24-2015, 09:35 AM   #2
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What you are describing is not physically possible. If that were true, there would be sections of the tire that wouldn't be as inflated as others which makes no sense. The pressure you read at the nipple will be the same as the pressure throughout the tire.

The explanation is probably much simpler. 39 psi sounds pretty high for a sedan. Overinflated tires can definitely cause your car to ride a little bit harsher. Over a couple of days, you might lose a little bit of tire pressure which causes your car to feel a little different. Additionally, overinflation could cause the center of the tire to contact the road slightly more than the edges and could very well be causing the uneven wearing you mention. I would double check or otherwise just try inflating them less (to 32-35 psi) instead and see if the problem persists.

If this doesn't help, can you please be more specific about exactly what feels wrong about the car? What kind of uneven wear are you seeing? What were you having trouble with concerning the alignment?
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Unread 04-24-2015, 04:33 PM   #3
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Quote:
Originally Posted by enderx475 View Post
What you are describing is not physically possible. If that were true, there would be sections of the tire that wouldn't be as inflated as others which makes no sense. The pressure you read at the nipple will be the same as the pressure throughout the tire.

The explanation is probably much simpler. 39 psi sounds pretty high for a sedan. Overinflated tires can definitely cause your car to ride a little bit harsher. Over a couple of days, you might lose a little bit of tire pressure which causes your car to feel a little different. Additionally, overinflation could cause the center of the tire to contact the road slightly more than the edges and could very well be causing the uneven wearing you mention. I would double check or otherwise just try inflating them less (to 32-35 psi) instead and see if the problem persists.

If this doesn't help, can you please be more specific about exactly what feels wrong about the car? What kind of uneven wear are you seeing? What were you having trouble with concerning the alignment?


yeah the inside of my car door says for the tires i have which come with the car.

The biggest problem i have is that my car never seems to sit perfectly flat when i put equal pressure into my tires until i've driven it for a few days... then it seems to balance out.

for example one day ill put all my tires to psi and it will feel like its sagging in the back left side or the next day front right.... i know it isn't suspension issues as i've had it checked and told everything was fine ?

so i just cant figure out why my car never seems to be sitting equal height all round when i put equal psi into the wheels.

thanks for any ideas.

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Unread 04-27-2015, 08:28 AM   #4
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If you could demonstrate with a picture your car sitting at some unequal height that would be much better.
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