Suggested PSI for my aftermarket tie size - Mustang Evolution

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Old 01-29-2015, 07:48 PM   #1
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Suggested PSI for my aftermarket tie size

Having a hard time finding a suggested psi for my larger sized tires. Factory tires are recommended 30psi for my 97gt. But I have 275/40/17 on the back and 255/40/17 on the front. Any suggestions based on these tire sizes and my model of Mustang? Thx

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Old 01-29-2015, 08:41 PM   #2
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Id stick to 30psi.
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Old 01-29-2015, 08:58 PM   #3
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I run 35 and my tires are 255 45 18

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Old 01-29-2015, 09:02 PM   #4
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I usually run my tires at 32-35psi cold.


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Old 01-30-2015, 07:49 AM   #5
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I run 35 in car tires and about 38 in the truck. Pretty much standard no matter what you are running.
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Old 01-30-2015, 09:01 AM   #6
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Don't be a baby fill that thing up with 150PSI.


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Old 01-30-2015, 09:11 AM   #7
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Thx everyone

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Old 01-30-2015, 11:56 AM   #8
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Tire pressures

If I were you, I'd check with the tire mfg or a place like "TireRack". Never trust oil change places or a run of the mill tire shop. They are still living in the age of the 3K oil change/32PSI ideas. From what I've learned, the lower profile tires run/wear better at higher pressures. We have been running 38PSI in our cars for years. (Jetta TDI's, Hyundai Sonatas. Trucks, totally different ballgame (3/4Ton Dodge 4x4), 65 no load, 80 loaded.......Just my 2cents, OK, maybe a dime's worth.
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Old 01-30-2015, 12:19 PM   #9
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Well if you have the correct load rated tires run that sort of PSI. I will not be running that in my Expedition lol.
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Old 01-30-2015, 01:31 PM   #10
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Quote:
Originally Posted by saltysnaks View Post
Having a hard time finding a suggested psi for my larger sized tires. Factory tires are recommended 30psi for my 97gt. But I have 275/40/17 on the back and 255/40/17 on the front. Any suggestions based on these tire sizes and my model of Mustang? Thx

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Hey Salty,

As others have stated, you will be fine anywhere between 32-36 PSI in the tires.

I personally run my Mustang at 35 PSI all around no matter what tires I have on the car (not including radials of-course)

Hope this helps and let me know if you have any other questions!

-Will
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Old 01-30-2015, 03:04 PM   #11
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Thx to all ...I got them 34-35. Rides nice!

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Old 02-02-2015, 11:40 AM   #12
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Quote:
Originally Posted by Speed_Mister View Post
Don't be a baby fill that thing up with 150PSI.


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I don't even run that in E load range tires on my F250. It's a Mustang not a Mack truck.....
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