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post #1 of 12 (permalink) Old 03-10-2009, 04:46 PM Thread Starter
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17x8.5 work?

If I got a rim at 17x8.5 and tires (Hoosier a6) of P225/45ZR17 which have a 8.8" tried width and was lowered by 2"-2.5" would I have problems with rub or clearence?

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post #2 of 12 (permalink) Old 03-10-2009, 08:02 PM
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I'd bet 99% that you would. I have 235's on my car on progress springs and would rub occasionally on real hard turns. Your only saving grace may be the overall tire height or bottoming out on uncut bumpstops.

'06 Red IRL Comp. Pkg.

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post #3 of 12 (permalink) Old 03-11-2009, 08:54 AM
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whats the offset on the wheels?
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post #4 of 12 (permalink) Old 03-11-2009, 11:44 AM
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I dunno guys, a 225/45r17 tire on a 8.5" wheel seems probamatic to me. Yeah, the tread width might look like a good match, but what about how the sidewalls meet the rim? I'm not sure you wouldn't get an odd wear pattern because of that.

Ok, so, like, yeah, umm....
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post #5 of 12 (permalink) Old 03-11-2009, 11:59 AM Thread Starter
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Quote:
Originally Posted by Tennpenn83 View Post
whats the offset on the wheels?
48mm offset

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Originally Posted by Shabodah View Post
I dunno guys, a 225/45r17 tire on a 8.5" wheel seems probamatic to me. Yeah, the tread width might look like a good match, but what about how the sidewalls meet the rim? I'm not sure you wouldn't get an odd wear pattern because of that.
These will be race only tires. No way would I DD on a6. Hoosier recomend a 7-8.5" rim for them, I could also get them in a 225/40r17 setup.

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post #6 of 12 (permalink) Old 03-11-2009, 01:23 PM
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Originally Posted by Eagle_f90 View Post
These will be race only tires. No way would I DD on a6. Hoosier recomend a 7-8.5" rim for them, I could also get them in a 225/40r17 setup.
So even they agree that a 8.5" rim in getting to be too wide for them. Do they make the A6 in a 245/45R17? Can you get the wheel in 7.5" wide?

Ok, so, like, yeah, umm....
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post #7 of 12 (permalink) Old 03-26-2009, 10:34 PM
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8.5 is fine, but not at a +48mm offset. To get a wheel wider than 8" (really 7.5") you need a LOWER than stock offset. An 8" wheel should be in the low 30's for best fit, an 8.5" wide rim would be in the low 20's, and a 9" wide rim would need to be somewhere around a +10mm offset to work well.

If 235's are rubbing, you probably have bigger wheels or the wrong sidewall height. 235/40/17 shouldn't rub.

A 245/45/ is just plain way off - waaay too tall, WILL rub. Unless that's a 245/45/SIXTEEN, whioch is a nearly perfect fit, lol.

A 245/40/17 is a good fit, may rub on a lowered car a tiny bit.

Try to go wider and rubbing could be an issue even on a stock height car. 245's fit fine on an 8" rim, so while an 8.5 or 9 would be better in some small way, it's really not worth trying to find that crazy offset since 17x8's are readily avilable.

What class are you autocrossing in? If you're running DOT R-compounds, you're most likely either in SM or SMF, in which case go with the 17x8's - or Stock, in which case you are limited to a 17x7 inch wheel, period, and to offsets between +48 and +36. I have run on 245/40/17 hossiers on the stock rims for quite some time, and Ionick05 has my old stock rims with 245/40/17 Hoosiers on them now. I have Motegi's in a 17x7 forGS this year, with 245/40/17 BFG R1's.

A 245/40/17 is as much rubber as is going to go under there without a widebody kit, lol.

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post #8 of 12 (permalink) Old 03-27-2009, 05:18 AM
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Big brother is 100%. 245 a6 i like that tire, use it on 9.0 and 9.5 wide rims
stretching the steer tire works okay not to worry; tis the rub that can give problems, but with the springs i use its not an issue on my RL...


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post #9 of 12 (permalink) Old 03-27-2009, 07:15 AM Thread Starter
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What class are you autocrossing in? If you're running DOT R-compounds, you're most likely either in SM or SMF, in which case go with the 17x8's - or Stock, in which case you are limited to a 17x7 inch wheel, period, and to offsets between +48 and +36. I have run on 245/40/17 hossiers on the stock rims for quite some time, and Ionick05 has my old stock rims with 245/40/17 Hoosiers on them now. I have Motegi's in a 17x7 forGS this year, with 245/40/17 BFG R1's.

A 245/40/17 is as much rubber as is going to go under there without a widebody kit, lol.
I will be running in SMF. Boy all these number are starting to confuse me. So what your saying is at 245/40/17 on an 8.5 will be fine even when lowered?

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Originally Posted by qwikredline11 View Post
Big brother is 100%. 245 a6 i like that tire, use it on 9.0 and 9.5 wide rims
stretching the steer tire works okay not to worry; tis the rub that can give problems, but with the springs i use its not an issue on my RL...
What 245 do you run? 245/40? How lowered are you?

If I get used to envying others those parts of myself that I am proud of will recede from me.
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post #10 of 12 (permalink) Old 03-27-2009, 01:43 PM
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A 245/40/17 is correct. If you're ordering rubber right now, the Kumho V710's are on sale at TireRack for $173 right now - if they'd had that deal when I ordered my R1's, I'd probably have 710's, lol.

17x8.5 is fine, just get the correct offset. Mid to high +20's would be optimal, low +30's would be acceptable, anything over a +32 or so MAY have rubbing issues.

Hope that helps.

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Quote:
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I miss the days when people weren't emo and just hung themselves instead of bitching on youtube....
RIP "Sally" - Pacific Blue 2005 Ion Redline Comp Pack

14.8 @ 96 mph, 2.3 second 60' - 100% stock on stock tires, 85 degrees out at 2200 ft altitude...

207 whp, 187 wtq, 100% stock uncorrected numbers on a mustang dyno...
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