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post #1 of 9 (permalink) Old 10-19-2002, 02:29 PM Thread Starter
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Wheel fitment question...

Will i have any problems fitting an 18x9 rim with a 24mm offset on a 96
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post #2 of 9 (permalink) Old 10-19-2002, 09:17 PM
 
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Try a 38mm offset...
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post #3 of 9 (permalink) Old 10-19-2002, 11:07 PM Thread Starter
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But will I have any problems with a 24mm. I am doing the mustang hub swap and can get mustang rims that are 18x9 with 24mm offset for very cheap. Also what size tires do i use to avoid potential problems
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post #4 of 9 (permalink) Old 10-19-2002, 11:08 PM Thread Starter
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And i believe you mean 36mm
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post #5 of 9 (permalink) Old 10-21-2002, 03:51 PM
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Exclamation Try This Link

http://www.c5-corvette.com/tirecalc.htm

I'm not certain what the offset does, but I have read, in a past post or two, that the widest tires that'll fit on the 'Birds are 255mm.

Hope this helps...

--Pete
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post #6 of 9 (permalink) Old 10-21-2002, 04:42 PM
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first of all, he means 39mm.

offset if the distance from the center of the wheel to the mounting point.

so the stock 6.5" wheel with 39mm offset gives back spacing of:
6.5 / 2 + 39mm /25.4 = 4.78 inches.

take the 9" wheel with 24mm offset gives:
9 / 2 + 24mm /25.4 = 5.44 inches.

these numbers tell us how much the inner rim of the wheel will be from the hub.
simply subtracting, we find that the 9" wheel in question will be .66 inches closer to the ball joint than the stock wheel. do you have that much? also remember that ires like to stick out farther than the rim, so add a quater inch for clearence.

to figure how it will look, again simple subtraction (6.5-4.78) tells us that the stock rim sticks out 1.72 inches from the hub. and comparing that to (9-5.44) 3.56 for the new wheel, we find that it will stick out 1.84 inches farther than the stock wheel.


the size tires allowed without other mods depends on the year. pre 93's can use 275's all the way around, while post 92s can only use 245s up front.




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post #7 of 9 (permalink) Old 10-21-2002, 05:53 PM Thread Starter
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But no problem with the 24mm's as long as I have 245's. I'm not talking about rubbing on extreme turning and in reverse, figured for that. And my rim manufacturer only had 36mm available for MN12
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post #8 of 9 (permalink) Old 10-21-2002, 06:08 PM Thread Starter
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Question

But according to the wheel manufacturer, they have two offsets
first is 24mm, which they say has 5.95" Backspacing
then they have 36mm, which they say has 6.25" backspacing
Not to go against what your saying, but i just want to get everything straight.
I'm just trying to make sure that I don't have any serious fitment issues. I don't want to go spending money on rims and then have them not fit.
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post #9 of 9 (permalink) Old 10-21-2002, 09:02 PM
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ah, found my error...backspacing also adds .25 inches on each side of the wheel for the rim.

however, because I forgot it for both the stock and 9" wheels, my numbers would stay the same.

.66 inches farher in,
1.84 inches farther out.

this adds to 2.5 inches, which is the difference between 9 and 6.5


You'll just have to go out to the car and measure your clearences.




Matt "Looks Like Egon" Davis
96 Alpine Green V8
98 Audi A8 4.2Q in Racing Green Totalled
02 Audi A8L 4.2Q in Black

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