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Old 08-24-2009, 02:22 AM   #1
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Autox slicks for the stock 15s?

Has anybody ran autox tires on teh factory 15" spilt spoke wheels? I have an extra set that I want to get some decent tires for autox. I didnt know how big you could go on those since idk how wide they are, maybe 205s? They come with 195s factory.

Id love to get 225s on them but i doubt their wide enough.

Any imput?


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Old 08-24-2009, 11:08 AM   #2
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205/50/15's will be your best bet for stock wheels, i've used that size alot & it works out well. 225's are too big for stockers, you would need a 7 or 7 1/2" rim for that, like rota slipstreams
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Old 08-24-2009, 11:18 AM   #3
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You can use a 225-50R15, it will fit on a 6.5" wide rim. You aren't asking too much of the tire to do that, recomended rim width for that size tire is a 6-8" wide rim. You might be able to get away with a wider tire for that rim size it will just come down to clearence and availability. A 225-50R15 has some good choices for AutoX tires.
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Old 08-24-2009, 03:06 PM   #4
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Hmm alright ill have to start looking for some 225s now I guess.
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Old 08-24-2009, 03:21 PM   #5
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You can use a 225-50R15, it will fit on a 6.5" wide rim
The 15" fOCUS wheels are 6" though, not 6.5".

That's really pinching a 225 on a 6" rim, and more often than not will result in reduced performance.
The contact patch may end up convex instead of flat due to the sidewalls being pulled in so much.

I'd take focusedaddiction's suggestion and find yourself some 205/50s.
Or, maybe a 215/XX, though I'm not sure if there's many to choose from in a 15" size.
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Old 08-24-2009, 03:59 PM   #6
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I run 205/50-15's on the split spokes. The guy putting these tires on (Kumho XS') said it was a giant pain and he would not go any bigger for fear of pinching on stock rims.
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Old 08-24-2009, 06:43 PM   #7
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Ok, so it sounds like I need 205s, or wider wheels, haha.

Thanks for the help guys!
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Old 08-25-2009, 12:33 PM   #8
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Since you've got the extra set of 15X6s lying around, that's a no brainer.
That's also a pretty light wheel.
By the time you buy some 7-7.5" wheels (to fit 225s), that are also as light as your existing wheels, you'll be spending quite a bit of money.

Just get 4-205/50s and hit the track!
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Old 08-25-2009, 01:36 PM   #9
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Lorin Mueller ran 205/50-15 and 225/50-15 on 15" wagon wheels when he had his HS car; was no faster on the 225s...so, yes a 205/50-15 is a good size for that wheel.
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Old 08-26-2009, 08:01 PM   #10
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Haha yeah I dont have money for an extra set of wheels. Ill def look into some kumho ecsta xs or something, Iv got some hard competiton next year and need to be prepared.
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