Tire Pressure PSI for 18x9 with 275/35

Discussion in 'SN95 4.6L Mustang' started by 01PonyGT, Jan 30, 2004.

  1. 01PonyGT New Member

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    What should my tire pressure be for everyday driving on the street? I have 18x9 rims with 275/35-18 at all four corners. The sticker in my glove box says 30psi front and rear, but that's for the stock 17x8 with 245/45-17. What's everyone running in their 18s??

    Thanks,
    WES
    01PonyGT, Jan 30, 2004
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  2. Beau Founding Member

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    what does the tire say?
    Beau, Jan 30, 2004
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  3. 01PonyGT New Member

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    The sidewall says max press is 44psi, but that's the maximum not necessarily the proper psi for every vehicle, right? Besides 44 psi would be an insanely harsh ride in a Mustang I would think.

    WES
    01PonyGT, Jan 30, 2004
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  4. Beau Founding Member

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    well i have 245/45ZR17's and they are at 35 PSI, so maybe run yours at 40 PSI?
    Beau, Jan 30, 2004
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  5. 01PonyGT New Member

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    Thanks for the replies 1990StangLX, but I was thinking I'd actually have to put less pressure than the OEM recommended 30psi because of the lower profile/stiffer sidewall of the 18" tire. Does that sound right?? Or am I just confused? How much psi are you guys with 18s running in you tires?
    WES
    01PonyGT, Jan 30, 2004
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  6. Beau Founding Member

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    i see what you mean, but my thoughts were since you have a lower profile you'd have to add more air to keep that sidewall really stiff and prevent any possibility of rollover
    Beau, Jan 30, 2004
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  7. wms004 Founding Member

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    I was told 35 psi when i got my tires put on my new Afs 03 cobra 18x9's about 2 weeks ago. Share some pics of your ride;)

    -wade

    [IMG]
    wms004, Jan 30, 2004
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  8. 007 Founding Member

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    I run my 275s on the rear at 35-36PSI. The smaller BFGs on the front have such a low profile I run them at 38PSI.
    007, Jan 30, 2004
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  9. 01PonyGT New Member

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    Thanls for all the replies evryone. I guess I was wrong then....lower profile means more air pressure, right?


    Thanks,
    WES
    01PonyGT, Jan 30, 2004
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  10. 01PonyGT New Member

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    I don't have any pics that are small enough for stangnet....whenever I post a pic I have to reduce it's size. I'm running out the door now for a weekend trip so I'll post some when I return.

    WES
    01PonyGT, Jan 30, 2004
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  11. Marks5.0! Founding Member

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    on my 265's i run 38 and the rear 295's i run 35
    Marks5.0!, Jan 30, 2004
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