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Thread: Backspace to fit 12" rim on mini tub foxbody

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    Forum Member NightMare Fox's Avatar
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    Default Backspace to fit 12" rim on mini tub foxbody

    Just as the title says...im looking to find out the correct Backspace to fit a 12" rim under my car. the car has mini tub done and coilovers.....im hearing anywhere from 6" to 7.5" BS when i have done some searches on other forums...thanks guys

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    Club Member Speedy's Avatar
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    Depends on if and how much the rearend has been shortened
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    Club Member Fryguy302's Avatar
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    Typically, if it's a fox rear end in a fox car and it's been shortened until the 9" end is all the way against the lower control arm mount, the car will use a 15x12 with a 6.5" backspace. Some will also use a small spacer, depending on the tire being run.
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    Forum Member NightMare Fox's Avatar
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    Quote Originally Posted by Speedy View Post
    Depends on if and how much the rearend has been shortened
    well it has not been shorten...is that a must?

    Quote Originally Posted by Fryguy302 View Post
    Typically, if it's a fox rear end in a fox car and it's been shortened until the 9" end is all the way against the lower control arm mount, the car will use a 15x12 with a 6.5" backspace. Some will also use a small spacer, depending on the tire being run.
    it has a 8.8 and not shortened

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    Club Member Fryguy302's Avatar
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    Quote Originally Posted by NightMare Fox View Post
    well it has not been shorten...is that a must?

    it has a 8.8 and not shortened

    Kinda weird to not shorten the rear end, that's really the purpose of the mini tub, and also what makes the mini tub look cool.

    If it's not shortened at all, a 12" wheel would be like an 8.5-9" backspace, which probably doesn't exist. Best to shorten the rear end.
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    Forum Member NightMare Fox's Avatar
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    Quote Originally Posted by Fryguy302 View Post
    Kinda weird to not shorten the rear end, that's really the purpose of the mini tub, and also what makes the mini tub look cool.

    If it's not shortened at all, a 12" wheel would be like an 8.5-9" backspace, which probably doesn't exist. Best to shorten the rear end.
    i was told by someone that it could be done without shortened but will do it if needed.......if so where is good place to have it done?

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    Club Member Billydroveit's Avatar
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    Quote Originally Posted by NightMare Fox View Post
    i was told by someone that it could be done without shortened but will do it if needed.......if so where is good place to have it done?

    I've seen it done with a 7.5" backspace wheel on a 10" rim, but not a 12. Take 2.5" off the axle and use a 6.5 BS 12" wheel like Raj said. If you're going to stretch a 28x10.5 tire on there you can get away with only 2" off the rear. To run a W tire or more you need the extra 1/2" off the axle.
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    Club Member TWISTED's Avatar
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    I tried a 7.5 backspacing on a 12" rim but it stuck out too much. Keep in mind the crazy backspaced rims have a weird barrel shape that won't allow some brakes. My wilwood's would fit. Not even close.
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    Forum Member NightMare Fox's Avatar
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    Quote Originally Posted by Fryguy302 View Post
    Typically, if it's a fox rear end in a fox car and it's been shortened until the 9" end is all the way against the lower control arm mount, the car will use a 15x12 with a 6.5" backspace. Some will also use a small spacer, depending on the tire being run.
    Quote Originally Posted by Billydroveit View Post
    I've seen it done with a 7.5" backspace wheel on a 10" rim, but not a 12. Take 2.5" off the axle and use a 6.5 BS 12" wheel like Raj said. If you're going to stretch a 28x10.5 tire on there you can get away with only 2" off the rear. To run a W tire or more you need the extra 1/2" off the axle.
    ok so you guys are saying 2.5" total 1.25" per side shortened......with a 6.5 BS....here is my next question what spline 33? im doing a stroked LS lq4 6.0 and adding a 88mm turbo looking around the range of 1000HP thanks for any info

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    Club Member Fryguy302's Avatar
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    Quote Originally Posted by NightMare Fox View Post
    ok so you guys are saying 2.5" total 1.25" per side shortened......with a 6.5 BS....here is my next question what spline 33? im doing a stroked LS lq4 6.0 and adding a 88mm turbo looking around the range of 1000HP thanks for any info
    33 will be fine for that power range, but at 1500, you will probably destroy the 33s and need to go to 35s. Also for the 12" with 6.5" bs, bring the 9" end all the way to the lower control arm mount. That distance may vary depending on the rear end, but it is likely around 2-2.5".
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