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Old 06-27-2004, 05:11 PM   #1
BHawk
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Default Will Kumho MX 255/40R17 fit the 04 STi stock rim?

I am considering a differen't tire size next time I need new tires. I would like to up size the width, but not the overall diameter of course. I am considering Kumho MX 245/40R17 or 255/40R17. Anybody have any idea if either of these will fit?
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Old 06-27-2004, 11:22 PM   #2
ripvw
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according to Kuhmo, you need an 8.5" wide wheel for 255/40x17

235/40x17 = 8" minimum (but the MX doesn't come in this size)
245/40x17 = 8" minimum

245/45x17 = 7.5" minimum but it's kind of a tall tire - lots wider than a 225 however...
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Old 06-27-2004, 11:44 PM   #3
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Dont think that will work. 235 is the widest that will fit our 7.5" rims.

BTW BHawk is your STi wingless?
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Old 06-28-2004, 12:31 AM   #4
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I'd do the 245/40's on an 8" wheel...

Last edited by Uncle Scotty; 06-28-2004 at 08:23 AM.
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Old 06-28-2004, 01:59 AM   #5
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I've heard that it will fit, but honestly, it's not a good fit.

Stick with 225/45 until you get 8" wheels.
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Old 06-28-2004, 05:07 PM   #6
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That's easy.

No.
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Old 06-28-2004, 09:09 PM   #7
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Yes they will fit. I guarantee anyone that says no in this thread has not even tried to fit them. The 255/40/17 would be my choice because you will keep factory tire height. They will also fit fine on a 7.5" wheel.
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Old 06-29-2004, 02:07 AM   #8
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Yes it will fit, and has been done before. But I certainly would not not recommend doing it. Feel free to try it and let us know how it compares to stock.

I currently run 255/40-17's on 17x9/8.5" F/R. I wouldn't even put a 255 on a 17x8.5 on the front of the car, it's pulled in to far for a tall tire. My other set is 245/40-17 on 17x8.5.

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Old 06-29-2004, 09:02 AM   #9
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while you can physically put the tire on the wheel it will not perform very well and the contact patch would be smaller than you would expect because the sidewalls are so, pinched in ..... and in order to reduce the extreme sidewall deflection it would cause you will have to run very high air pressure further reducing the contact patch and causing irregular wear
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Old 06-29-2004, 10:16 AM   #10
mav1c
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OK....sure....I suppose you could FORCE the tire on, but it'd be a waste of time and money for all the reasons Luke stated.
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Old 06-29-2004, 11:00 AM   #11
del105
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Quote:
Originally posted by Luke@tirerack
while you can physically put the tire on the wheel it will not perform very well and the contact patch would be smaller than you would expect because the sidewalls are so, pinched in ..... and in order to reduce the extreme sidewall deflection it would cause you will have to run very high air pressure further reducing the contact patch and causing irregular wear

but it still will have a larger contact patch than the 225.

The only reason I can see for adding a larger tire is for racing and sometimes you're limited by the size of the wheel and ever bit helps. I don't really see the point in running a larger tire on the street though.
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Old 06-29-2004, 11:54 AM   #12
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Quote:
but it still will have a larger contact patch than the 225
Doubt it. The sidewalls will be so pinched in the tread surface will become rounded. (like a motorcycle tire). Plus the tire will squirm a lot because the sidewalls will be at such a severe angle.

Just because it will fit on the rim, doesn't mean it's better. There's a reason why tire manufacturers have recommned wheels widths for differrent size tires.
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