265/45/18 on 8 inch rim width ?

Discussion in 'Wheels & Tires' started by abmobil, Jan 19, 2020.

  1. abmobil

    abmobil Well-Known Member

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    I’m fine with my stock wheels on my 17 GT but wanting a wider contact patch.

    Anyone see a problem putting that size tire on the car that currently has 235/50/18? I am considering this oddball size as it is the closest to the stock circumference.
     
  2. shogun32

    shogun32 Well-Known Member

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    does the manufacture's recommended rim width even list 8 as an option?
     
  3. OP
    OP
    abmobil

    abmobil Well-Known Member

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    Discount tire has 5 tires in this size that list the rim width between 8, and 10 inches.

    Trying to better prep the car for boost without changing wheels at the moment.
     
  4. Zathras

    Zathras Well-Known Member

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    I'm no authority but most of what I've read online would suggest that for handling purposes, 245 would be as wide as you should go with an 8" wheel. I know some people have gone to 255. But above that you get problems where even if the tire physically fits on the rim, the sidewall is too pinched and the contact patch gets distorted, which affects handling and tire wear.

    255/45/18 would still be pretty close to the OEM tire circumference.
     
  5. BmacIL

    BmacIL Enginerd

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    255/45r18 absolute max. 235-245 far better fit. Going wider on a narrow rim is pointless and won't put any additional rubber on the road, along with having sloppy handling.
     
  6. BeastAR

    BeastAR Well-Known Member

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    I believe the recommendation is 8.5" wide to run that size tires. Might want to look a size down or a wider wheel
     
  7. Dana Pants

    Dana Pants Well-Known Member

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    There I was, feeding my sidewall to the ground, when all of a sudden...62853953-4B17-4936-934A-6F0B688E677A.jpeg

    My 275 on an 18x9
     
  8. BmacIL

    BmacIL Enginerd

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    That's a whole extra inch of wheel width for 10 cm more section width compared with OP's ask.

    275 on a 9" is generally OK, but more than that not really. For autocross it helps more than hurts, as you've found.
     
  9. Zathras

    Zathras Well-Known Member

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    Are those 275/40 ? or 275/35? Thanks...
     
  10. shogun32

    shogun32 Well-Known Member

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    that looks like a whole lot of roll-over to me. I would guess /35 at most.
     
  11. Dana Pants

    Dana Pants Well-Known Member

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    275 35 R18.
     
  12. Grintch

    Grintch Well-Known Member

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    Right, that is what I find in a quick tire spec check at the Tire Rack.

    Remember that taller side walls often allows a smaller wheel for a given width per the manufacturers recommendations.
     
  13. Norm Peterson

    Norm Peterson corner barstool sitter

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    265/45 carries a recommended range of wheel widths ranging from 8.5" to 10". That's a tire industry standard, and while it doesn't guarantee that you'll have issues or problems by going outside it on the low end, you would be running it in a manner that would tend to increase sidewall flexing and heat generation (tire enemies) and softer, less precise handling and cornering. Dare I think 'numb', even . . .

    If a wider contact patch is what you're chasing, look for tread width dimensions in 255/45. That at least lists 8" as the minimum recommended fitment. I'd defy you to notice the difference in section width (at the maximum sidewall bulge) once mounted and installed on the car.

    It's not worth obsessing over matching the OE tire diameter exactly.


    Norm
     
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