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Old 02-17-2006, 11:00 PM   #1
adhhaahok
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Default Need To Know The Correct Tire Inflation

So, i got 17" wheels with 205/40's on them. they have a max press of 49 PSI. the shop that mounted and balanced them said that 40 in the front and 35 in the back was where it needed to be. they are currently at 45 in the front and 40 in the back. he said that if i have them at 49 all around, they will wear very quickly in the middle of the tires. anyone have any recomendations for me? thanks a lot guys.

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Old 02-17-2006, 11:06 PM   #2
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Post Re: Need To Know The Correct Tire Inflation

I would go with what the Tires say!

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Old 02-17-2006, 11:58 PM   #3
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Default Re: Need To Know The Correct Tire Inflation

Well the tire guy is right about them wearing in the center if they are overinflated. The high pressure causes the tire to "bluge" and the car rides on the center of the tire. The opposite is true about underinflation. The tires will wear primarily on the edges. You have to keep in mind that you have a light car and it won't take too much pressure to be overinflated.

I was about to say refer to the tire inflation placard in the car but I am not sure how applicable that would be with the non stock tires.

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Old 02-18-2006, 03:37 AM   #4
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Default Re: Need To Know The Correct Tire Inflation

For this one I would listen to the guys at the tire shop. The listing of 49 psi is the maximum safe, not the recommended pressure, that varies with the application. I recently got the same size tire, and just go 35 all the way around.

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Old 02-18-2006, 04:03 AM   #5
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Default Re: Need To Know The Correct Tire Inflation

You'll need to do some math. Figure out the size of the CONTACT patch of the tread of the new tires (in sq. inches) and compare it to the size of the contact patch of the OEM size tires. (in sq. inches) Then do the math.

Example:
OEM contact patch = 12 sq. inches (3 X 4) standard inflation is 33 psi. 33 x 12 = 396

"New" contact patch = 20 sq inches (4 X 5) 396/20 = 20 PSI

That is your starting point as far as what is needed to support the weight of the car. The rest is a matter of "tuning" to what makes the TIRE perform the way you want it to. 45 and 40 is WAAAAYYY too MUCH, and will make the car ride like a tank, handle like a skate board, and center wear the tires like nobody's business.

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Old 02-18-2006, 09:30 AM   #6
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Default Re: Need To Know The Correct Tire Inflation

Old school tire inflation test- A short burnout on a smooth patch of concrete; look for even tire contact. If too light in centre of stripe, increase inflation untill even. I guess on a FWD car you could apply e-brake and check all 4 at once!

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Old 02-18-2006, 09:48 AM   #7
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Default Re: Need To Know The Correct Tire Inflation

Quote:
Originally Posted by spencerforhire
I guess on a FWD car you could apply e-brake and check all 4 at once!
You'll be waiting for a long time to see a burnout from those rear tires. But I'm sure the diff pin will be happy.

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Old 02-19-2006, 01:29 PM   #8
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Default Re: Need To Know The Correct Tire Inflation

I think you missed the point; if the e-brake is on,the car will drag the rear wheels enough to see the rear contact patch as well.

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Old 02-20-2006, 01:12 AM   #9
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Default Re: Need To Know The Correct Tire Inflation

Quote:
So, i got 17" wheels with 205/40's on them. they have a max press of 49 PSI. the shop that mounted and balanced them said that 40 in the front and 35 in the back was where it needed to be.
the correct tire pressure would normally be 30 psi front and 26 psi rear. however, if the 205/40-17 tires you bought don't have a load index of at least 87 then you probably need more air in them than the normal amount. you should contact the tire manufacturer and tell them that your Saturn OE tires were 195/60-15 with 30 psi front and 26 psi rear and they had a load index of 87 and ask them what they recommend. let them know your Saturn weighs about 2400 lbs. the pressures marked on the sidewall of the tires are the MAX pressure that the tires can handle, not a suggested pressure for any particular vehicle. what is the load index and speed rating of the tires you got? it should be something like 87H or 91W or 85S or something like that with a number and letter together. the stock tires for example are 195/60-15 87H. what brand and model tires did you get?

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Old 02-20-2006, 01:45 AM   #10
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Default Re: Need To Know The Correct Tire Inflation

30 in the front 26 in the rear. Check the sticker on your door. Always go by that unless the rating on the door is higher than the max on the tire.
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