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Discussion Starter #1
Hello,

Before I sold my 97 Cougar I put on a set of 17'' Ford Racing Cobras on it.

The new owner would like to know what is the largest tire that can be used with out a rub?

If I recall it has 255/45/17 now.
 

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1997 Thunderbird 4.6, 1998 Mark VIII LSC
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I've read that 255/45 is about all you'll get, at least on the fronts. If I ever get my hands on the wheels I want I'll probably go that size up front with 285s in the rear.
 

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Discussion Starter #6
I have a set of three 235/55/17's I'm about to remove from my crown vic and he wanted to use them if they would fit.

I'm just unclear about the 55 I think it will be to tall and rub.
 

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1997 Thunderbird 4.6, 1998 Mark VIII LSC
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235/55 is 27.2" in diameter, stock 205/70 is 26.3" in diameter. 255/45 is 26.0" in diameter (and 285/40 is 26.0" as well fwiw).
 

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Discussion Starter #10
235/55 is 27.2" in diameter, stock 205/70 is 26.3" in diameter. 255/45 is 26.0" in diameter (and 285/40 is 26.0" as well fwiw).
So I guess the question is does the car have an extra 0.9?'' lol

I hope that math is right, I never was good at math lol..
 

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1997 Thunderbird 4.6, 1998 Mark VIII LSC
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Don't forget, that's diameter. You'll actually be 0.9" taller overall, however only 0.45" of that will be over the height of the stock size but on both sides.
 

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1997 Thunderbird 4.6, 1998 Mark VIII LSC
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I honestly don't think an extra half inch is going to make that big a difference in clearances unless you're ridiculously lowered. The biggest thing I'd worry about is the speedo; with a 235/55 you'd be 3% off, more or less meaning that at 60MPH your speedo says you're going 58.
 
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