Tire Help Please! - Ford Mustang Forum
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post #1 of 8 (permalink) Old 11-16-2018 Thread Starter
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Tire Help Please!

Guys, I have to order new meat TODAY.
I have a stock GT Premium with 19's. Factory tires all around 255/40.
After a discussion with the tech at discount tire, he stated the widest tire his computer shows is a 285/35/ for the rear of my car. Anything larger than that states "test fit" and since I am ordering, I can't do that.

Current order:
Front 255/40 stock size
Rear 285/35 (hoped I could go a tad wider)

Does anyone have experience with a wider tire on this factory 19" rim?

Thanks,

THC

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post #2 of 8 (permalink) Old 11-16-2018
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That tire guy apparently has not taken Tires 101, do not believe anything he tells you.

The correct width of the tire is limited by the width of the wheel. So you need to know the width of the wheel, before you pick the size of the tires to go on it. The width should be marked on the back of the wheel. I am not sure about your wheels, but guessing based on the stock tire size, they are probably 9" wide.

Knowing the wheel width, next you check the tire manufacturer's recommendations for the tires. I don't think any tire manufacturer will recommend a 285 tire on a 9" wheel. You can look this up on Tire Rack. The specs can vary a little across different makes and models; below is link to one example; minimum rim width for 285/35-19 is 9.5" (check the "specs" tab if it does not come up from the link)

https://www.tirerack.com/tires/tires...omCompare1=yes

You can ignore the manufacturer's specs if you want, but you will just be paying more for wider tires and you won't get the performance from them that you are paying for. You are better off sticking with the "measuring width" wheel, meaning select a narrower tire so that the "measuring width" matches your wheels. The measuring width for the 285/35-19 is 10"; meaning 10" (or wider) wheels would be good for those tires.

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post #3 of 8 (permalink) Old 11-16-2018 Thread Starter
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Thanks for the reply. Heck he was using some software in the system that did show the stock wheels are 9". Once he ask for the available tire sizes, it was green down to the 285 and then everything beyond that was red meaning they don't fit. Now I'm bummed all over again wanting to go a little wider.

THC
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post #4 of 8 (permalink) Old 11-16-2018
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it is possible that the wheels are 9.5" ; if so then 285 is probably on the high side of recommended range . . . you could ask them what they are showing for wheel width

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post #5 of 8 (permalink) Old 11-16-2018 Thread Starter
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Will do - thanks
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post #6 of 8 (permalink) Old 11-19-2018
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Factory GT premium wheels are 9". 285 is pushing it in a bad way on that width rim. For comparison, the performance package wheel is 9.5" in the rear. I just ordered a pair of NITTO 555 G2's and the most narrow rim they list for the 285/35/19 is 9.5". Other tire manufacturers may be different, but generally speaking I wouldn't go wider than 275 on a 9" wheel.

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post #7 of 8 (permalink) Old 11-19-2018
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The 285's actually require at least a 10" wheel, the tire is 11.2" wide.. Your speedo will be off a tad as well
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post #8 of 8 (permalink) Old 12-28-2018
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^Not according to Nitto. I'll trust the manufacturer rec. I have them on the car and have no issues. Certainly would not go any wider on a 9.5" wheel. Any difference in speedo reading would be negligible. Sidewall height is actually a ratio to width, not a straight apples to apples measurement.

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