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Widest Tires on STOCK rear rims?

Discussion in 'SVT Shelby GT500' started by my69camaro1, May 26, 2009.

  1. my69camaro1

    my69camaro1 New Member Established Member

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    I did a search but I don't want to get different rims or have mine widened. What's the widest tire in stock height I can fit with a stock suspension? All my buddys are rocking 315's on their 03-04's and my sh*t's small.:p

    Sorry if this has been asked a million times.:burn:
     
  2. frydguy79

    frydguy79 New Member Established Member

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    305's are about the biggest that will fit the stockers
     
  3. FastOldGuy52

    FastOldGuy52 New Member Established Member

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    Like was said 305's are the biggest that can be run on the stock 9.5 inch rim. You can have the rears widened to 11 inches and run 335 nittos if you center the axle with an adjustable panhard bar.


    This thread has a discussion if you are interested.

    http://www.svtperformance.com/forums/shelby-gt500-150/568958-nitto-335-30zr-18-a.html
     
    Last edited: May 26, 2009
  4. my69camaro1

    my69camaro1 New Member Established Member

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    Ok, 305s will do just fine... Is a Nitto 555R 305/35R18 in the ball park, or MT ET Street 305/35R18? Close to stock height?
     
    Last edited: May 26, 2009
  5. skyhighsd

    skyhighsd New Member Established Member

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    MT's are little shorter than stock, but hook so much better then Nitto's
     
  6. GOTSVT?

    GOTSVT? Propolis Established Member

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    Go with the M/T 305's
     
  7. Dave07997S

    Dave07997S New Member Established Member

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    If you are talking what would safely fit or what works best the answer would be different. A 9.5" wide wheel will not support a 305 width tire. In fact most 305 tires will require at a minimum a 10.5" wheel. A 285 IMHO is the widest you would want to go for a 9.5" wide wheel and even that is going to be pinched a tad. Keep in mind that D/R's in 305's, well at least the Nitto's run narrow so that's why they will work sometimes with the OEM wheel and even then Nitto recommends a 10" wide wheel for their D/R. If you are at all into handling the widest you will want to run on the OEM wheel is a 285, in fact you can run 285s on all 4 corners. To run a 305 properly it should have at a minimum a 10.5" wide wheel. If you go to tire rack and plug in the size (couldn't find a tire on tire rack with a 305 section width in a proper 18" size for the Mustang) you will see that the minimum recommended wheel width is 10.5".

    Dave
     
    Last edited: May 26, 2009
  8. Pauliers

    Pauliers New Member Established Member

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    I have heard of people running 315's, on the stock wheel, but I am thinking of running a 305, and the stock rear size of 285 on the front. I would love to find a good all around tire that will give me a bit more bite, in these sizes and try it out. The stock rears are going to be gone quick
     
  9. my69camaro1

    my69camaro1 New Member Established Member

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    Would it be better to get a slightly taller tire or a slightly shorter tire. Nothing seems to match the 27in mark right on... And gears are a way off mod for me.....
     
  10. Dave07997S

    Dave07997S New Member Established Member

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    I would go with slightly shorter. As long as the front and rear are within .3" or so from each other in diamater you shouldn' have any problems. If you are going to keep the OEM wheels I wouldn't go above 285's on all 4 corners if you are into corner carving at all. A 305 tire is pinched pretty bad on a 9.5" width wheel.

    On my 997 I am going with a 305 tire on a 11" wide rear wheel which is the OEM size for this car.

    Dave
     
  11. 09Troublemaker

    09Troublemaker " That don't sound stock" Established Member

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    the Toyo T1R's I'm getting recommend an 11" wheel for my 305's

    O/P I would get the wheel widen to accommodate a 305...IMO
     
  12. Dave07997S

    Dave07997S New Member Established Member

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    Yea minimum rim width recommended is 10.5" with 11" being optimal.

    You are going with 20's right? Toyo doesn't make a 305 in 18's or 19's.

    Dave
     
  13. Dave07997S

    Dave07997S New Member Established Member

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    Nitto recommends a 11.5" wheel width for the 335/30/18's. Will the tire fit on the rim with quite a bit of effort yes. However the sidewall is going to be pinched very bad making the footprint distorted. You would be better off with the 305/35/18 on a 9.5" rim as the min recommended is 10".

    Dave
     
  14. FastOldGuy52

    FastOldGuy52 New Member Established Member

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    Looks like its a 1/2 inch either way. My 305 Nittos on 9.5 inch wheels worked great. I suspect the 335 on 11 inch wheels will work just fine also. In fact by adding 1.5 inches to the wheel its increasing by 37.5 mm and the tire going from 305 to 335 is only increasing 30mm so it should fit better than the 305 on a 9.5inch wheel. Unless my calculations are off. I can tell you that the 305 on the 9.5 wheel worked great and had normal appearing wear on them. Other people are running Nitto 335 on 11 inch wheels without issues. My avatar pic is a 305 nitto on a 9.5" wheel.


    9.5 inches X 25.2 = 239.4 mm / 305 mm = .78 11 inches X 25.2 = 277.2mm / 335mm = .82 so there is more rim per mm tire using and 11" wheel with a 335 mm tire than there is using an 9.5 inch wheel and a 305mm tire.
     
    Last edited: May 28, 2009
  15. Dave07997S

    Dave07997S New Member Established Member

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    I think it's more of an issue of sidewall support. The min recommended wheel width is directly off of Nitto's website. The .5" difference for the min recommended wheel width is probably not a real safety issue but it will effect the handling of the car. If I was to do a 305 on a OEM wheel I would have it widened.

    Porsche does the opposite..they stretch the sidewall out to an inch of their life. The 997S comes with a 295/30/19 tire on a 11" wide wheel. That is the max recommended wheel width for this tire. In fact the GT3 comes with Mich PSC's in a 305 width on a 12" wide wheel, .5" beyond the max recommended wheel width.

    Dave
     
    Last edited: May 28, 2009
  16. FastOldGuy52

    FastOldGuy52 New Member Established Member

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    This is interesting

    10" wheel X 25.2 mm = 252mm / 305mm = 0.826 wheel to 1 mm tire [recommended by Nitto]

    11' wheel X 25.2 mm = 277mm/ 335mm = 0.827mm wheel to 1 mm tire
     
  17. Dave07997S

    Dave07997S New Member Established Member

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    Makes sense, as you go wider by almost a inch in width of tire you get the same ratio when you widen the wheel. The difference is the fact that the 335 tire is wider by more than an inch...by almost 5mm.

    Now a 9.5"X25.2/305 will give you .785mm wheel to 1mm tire.

    Dave
     
    Last edited: May 28, 2009
  18. FastOldGuy52

    FastOldGuy52 New Member Established Member

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    What I found interesting was the recommend ratio for the 305 with 10" was 0.826 to 1.0. And the ratio on the 335 with 11" wheel was virtually the same. So I would have to assume that running a 335 on a 11" wheel wouldn't be to bad for the tire performance.
     
  19. Dave07997S

    Dave07997S New Member Established Member

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    Ahh, I see...I wonder what is the criteria they use to decide such things.

    Dave
     
  20. 09Troublemaker

    09Troublemaker " That don't sound stock" Established Member

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    correct-20 inch set-up:beer:
     

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