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post #1 of 7 (permalink) Old 09-12-2016, 12:52 AM Thread Starter
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...yet another odd question...

Black Bullitt Mustang Wheel - 18x8 (05-14 GT, V6) - Free Shipping

I was thinking about going through the ridiculousness of doing a Mustang hubswap on my 'new' 1996 MK8, and was perhaps looking at this wheel instead of an 18x9 (or a 17x8, tires for 1*" wheels are the same price nowadays), and avoid stretching out a 245/45 18 to fit a 9" wheel. This wheel has a 30mm backspacing.

Your thoughts...if anyone has any?

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post #2 of 7 (permalink) Old 09-12-2016, 04:56 AM
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Originally Posted by EvilMooseofDoom View Post
Black Bullitt Mustang Wheel - 18x8 (05-14 GT, V6) - Free Shipping

I was thinking about going through the ridiculousness of doing a Mustang hubswap on my 'new' 1996 MK8, and was perhaps looking at this wheel instead of an 18x9 (or a 17x8, tires for 1*" wheels are the same price nowadays), and avoid stretching out a 245/45 18 to fit a 9" wheel. This wheel has a 30mm backspacing.

Your thoughts...if anyone has any?
A couple of thoughts; the first is that I can't imagine those wheels looking good on a MK8. I know it's just an opinion but the styling doesn't match. The second thought is that those wheels have 30mm of offset, not backspacing. They are very different measurements. And, a 30mm offset is going to stick out just a bit on your car. IIRC, about 35-38mm is the right offset for an 8" wheel on these cars.

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post #3 of 7 (permalink) Old 09-12-2016, 10:12 AM
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+30mm on an 8" wheel is about the equivelant of a 36mm offset 9" wheel as far as sticking out is concerned, it's pretty ideal IMO

-Matt
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post #4 of 7 (permalink) Old 09-12-2016, 11:06 AM
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+30mm on an 8" wheel is about the equivelant of a 36mm offset 9" wheel as far as sticking out is concerned, it's pretty ideal IMO
They'll stick out about 2/10 an inch more than an 18x9 with 36mm offset, not anything to worry about. I run 18x9 with 35mm offset and haven't had any rubbing (yet, knock on wood).

This is a GREAT site for size comparisons, and it shows how much the wheel will stick out/in compared to stock.
Custom rims, wheel tire packages for your ride - RIMSnTIRES.com

On the Bullitt's, I had a set of the chrome ones on my 99 Mustang, the chrome was VERY cheap and flaked off, letting the metal underneath start to look rough.

I ground them down, plastidipped them, and they turned out great. But the black ones should hold up better.

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post #5 of 7 (permalink) Old 09-13-2016, 02:27 AM Thread Starter
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Quote:
Originally Posted by Woodman View Post
They'll stick out about 2/10 an inch more than an 18x9 with 36mm offset, not anything to worry about. I run 18x9 with 35mm offset and haven't had any rubbing (yet, knock on wood).

This is a GREAT site for size comparisons, and it shows how much the wheel will stick out/in compared to stock.
Custom rims, wheel tire packages for your ride - RIMSnTIRES.com

On the Bullitt's, I had a set of the chrome ones on my 99 Mustang, the chrome was VERY cheap and flaked off, letting the metal underneath start to look rough.

I ground them down, plastidipped them, and they turned out great. But the black ones should hold up better.
Chrome and aluminum don't get along very well. I refuse to buy any aluminum wheels that have been chrome plated, either by an OEM or an aftermarket wheel manufacturer.

I might be leaning towards a 1999-2001 Cobra wheel anyway (I know that these fit, or at least the two that I've seen with them on there cleared without rubbing), as stated in the 13" front brake thread, I just test-drove a vehicle with 245/45 18's, and was dumb/smart enough to drive down the main road next to my house...I'm not sure I can keep sidewalls on anything while driving down that road, so I'm leaning more toward a 245/50 17 at this point.

IF I recall correctly, weren't the 1999-2001 Cobra wheels around a +24mm offset? I might also have something in and around a +30mm offset as well...

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Last edited by EvilMooseofDoom; 09-13-2016 at 02:37 AM.
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post #6 of 7 (permalink) Old 09-13-2016, 09:59 AM
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94-01 Cobra wheels are 17x8" +30mm, 1995 Cobra R was 17x9" +24mm, and 03-04 Cobra were 17x9 +26mm

Quote:
Originally Posted by Woodman View Post
They'll stick out about 2/10 an inch more than an 18x9 with 36mm offset, not anything to worry about. I run 18x9 with 35mm offset and haven't had any rubbing (yet, knock on wood).

This is a GREAT site for size comparisons, and it shows how much the wheel will stick out/in compared to stock.
Custom rims, wheel tire packages for your ride - RIMSnTIRES.com

On the Bullitt's, I had a set of the chrome ones on my 99 Mustang, the chrome was VERY cheap and flaked off, letting the metal underneath start to look rough.

I ground them down, plastidipped them, and they turned out great. But the black ones should hold up better.
Math is not my strength but that website is wrong Offset is from the centerline, so it doesn't matter if it's a 8" or 9" wheel, the centerline is dead center with the only difference being an extra 1/2" (12.7mm) on each end of the 1" wider wheel. Take two wheels with identical offsets, +30mm in this case, one 8", the other 9" - the 9" wheel will stick out(and in) 12.7mm farther than the 8" would. In order for the 9" to sit where the 8" +30mm wheel does from the outside the 9" wheel would need to have about a 42mm offset.

I was wrong about it being equal(I forgot to divide by 2) so the 8" +30mm would will tuck IN about an extra 6mm over the 9" +36mm.
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post #7 of 7 (permalink) Old 09-13-2016, 12:16 PM Thread Starter
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Originally Posted by XR7-4.6 View Post
94-01 Cobra wheels are 17x8" +30mm, 1995 Cobra R was 17x9" +24mm, and 03-04 Cobra were 17x9 +26mm

Math is not my strength but that website is wrong Offset is from the centerline, so it doesn't matter if it's a 8" or 9" wheel, the centerline is dead center with the only difference being an extra 1/2" (12.7mm) on each end of the 1" wider wheel. Take two wheels with identical offsets, +30mm in this case, one 8", the other 9" - the 9" wheel will stick out(and in) 12.7mm farther than the 8" would. In order for the 9" to sit where the 8" +30mm wheel does from the outside the 9" wheel would need to have about a 42mm offset.

I was wrong about it being equal(I forgot to divide by 2) so the 8" +30mm would will tuck IN about an extra 6mm over the 9" +36mm.
At one point I had most of this figured out...but then the 1960's happened (all over again) and I've spaced it off. I think I grew weary of attempting to figure out what I was seeing wrong here and went off to sit in a corner and read a Jane Austen novel. The 18" Bullitt was simply a larger-diameter version of the 17" Bullitt, I know the 17" Bullitt, Mach I and Cobra wheels fit on very-ugly Mark 8's, 18" tires are about the same price as 17's now, so I was attempting to use the default layout, but with one-inch-larger diameter. Yeah. Something like that anyway.

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