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Old 03-20-2011, 06:53 PM   #1
Jman0079
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Question Correct Tire Pressure

Hi everyone,

I've been seeking what the correct tire pressure should be for my car. The tag on the door has faded so badly, I can't even read it.

I have a 2006 G6 GT with 225/50/R17 Tires which I just had a new set installed last month.

If anybody can forward me how much pressure each correctly inflated tire is (in psi)

Thanks.
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Old 03-20-2011, 07:57 PM   #2
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That would be 30psi for front/rear, 60psi for the spare
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Old 03-21-2011, 03:00 AM   #3
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it says 30psi front/rear on mine... but isnt it supposed to be higher psi for front coz of engine weight??
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Old 03-21-2011, 05:06 AM   #4
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Quote:
Originally Posted by jong View Post
it says 30psi front/rear on mine... but isnt it supposed to be higher psi for front coz of engine weight??
Mine says 30 psi aswell. Eveytime I take my car into the dealership or into my garage I always get heck for "over inflating " past 30 psi.
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Old 03-21-2011, 07:22 AM   #5
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Originally Posted by pocketaces2012 View Post
Mine says 30 psi aswell. Eveytime I take my car into the dealership or into my garage I always get heck for "over inflating " past 30 psi.
Thanks guys. When I had my tires replaced, each tires was inflted to 40 psi which I thought was a little too high. But 30 seems a little low especially with all the bumps and exposed potholes we have here in Toronto. For the time being, I've kept it at 35 psi but I may need to call around to figure out which tire pressure should give me the best fuel efficiency.

I was also hearing about inflating the tires with Nitrogen. Has anybody had this done and is it worth it?
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Old 03-21-2011, 08:24 AM   #6
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You will find that almost all GM cars call for 30 psi front and rear regardless of tire size, even if you change sizes. I have noticed some center wear so I typically will run about 28 psi. As for the most fuel efficent, well max psi will give the most fuel efficent, but worst ride quality. Nitrogen is a relatively new concept, but keeps the tire at a lower operating temp helping to wear a little bit longer, you will lose less of it due to temp changes, but it is a PITA trying to find a place that has it if you need to adjust your pressures. If someone dosent have it you need to let all your air out of the tires before adding the "regular" air.
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Old 03-21-2011, 09:01 AM   #7
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The three main things about nitrogen in the tires is:
- Less seeps through the tire rubbers due to the larger molecule size
- Fluxuations in operating temperature inside the tire stays consistent so the PSI stays the same.
- Less moisture in the tire which prevents rotting of the tire. Pure nitrogen is dry, while air compressors can still compress the moisture from atmosphere.

I always keep my tires around 30 psi (stock tire size). When I got my tires put on though, they inflated it to 37-40 psi. I asked why and they said that it was probably temperature fluctuation. HA!
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Old 03-21-2011, 09:16 AM   #8
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When I got my tires put on though, they inflated it to 37-40 psi. I asked why and they said that it was probably temperature fluctuation. HA!
They have to over inflate to seat the bead, but must have been too lazy to set it to the correct psi. The temp change is def some BS they were trying to feed you, since it couldn't have taken more than an hour to mount them all. It is hard to find a shop you can rely on!
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Old 10-23-2012, 05:13 PM   #9
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does anyone think that 30 PSI is a little too low for pontiac g6? everytime i look at my tires it looks like it needs air, but it's at the correct 30PSI
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Old 10-23-2012, 10:56 PM   #10
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30 psi is the correct optimal tire pressure for all 4 tires even though you will get uneven tread wear.
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Old 10-24-2012, 06:03 AM   #11
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Well 30psi for the rears are okay, but through fronts should be more. Concerned more about the fronts than the rear.

I am not sure what other people get as thread wear for the fronts. But it looks like more wear on the sides of the tire than the center of the tires.
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Old 10-24-2012, 09:31 AM   #12
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I run my tires around 35-36 psi. The ride is a bit harder but I get better MPG. And its not over inflated to the point of bursting or bad tread wear. Always been around 36 and wear is perfect still.
Plus it stiffens up the tires to the point of increased handling. Which is nice
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Old 10-24-2012, 10:45 PM   #13
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Originally Posted by vikz99 View Post
Well 30psi for the rears are okay, but through fronts should be more. Concerned more about the fronts than the rear.

I am not sure what other people get as thread wear for the fronts. But it looks like more wear on the sides of the tire than the center of the tires.
Yes the edges will wear more in the front tires. It's designed that way.
Increasing the tire pressure will upset handling, increase under-steer, and stiffen the ride. Stick with factory recommended tire pressure for best overall performance.
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Old 10-25-2012, 05:35 PM   #14
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Originally Posted by mrslcom View Post
Yes the edges will wear more in the front tires. It's designed that way.
Increasing the tire pressure will upset handling, increase under-steer, and stiffen the ride. Stick with factory recommended tire pressure for best overall performance.
It's DESIGNED that way??? that the lamest thing I've ever heard. Designed for tires to wear like there are under-inflated..

I am going to raise my PSI to 32-33. I rather have my tires last longer than 25,000kms!
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Old 10-25-2012, 05:51 PM   #15
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I run mine hard at the advice of a friend who owns and runs a shop and regularly races his car. I have to run 40 when on a banked track. Otherwise my sidewalls take a beating.
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