LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Rim size and backspacing

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Old Dec 24, 2010 | 04:30 AM
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Default Rim size and backspacing

im in the market for some drag rims and was curious

if i go with a 15x10 what BS would i need
and if i go 15x8 waht would the BS needed.

correct me if im wrong but,
15x10 would need 7.5 BS or would a 6.5 work?
and 15x8 = 5.5 BS ????
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Old Dec 24, 2010 | 05:01 AM
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depends which is more availible to you? are you going to have to go out of your way to get one of the sets more than the other?
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Old Dec 24, 2010 | 05:05 AM
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no either size is available, just wanting to be sure i have the rim size to bs correct
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Old Dec 24, 2010 | 05:05 AM
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also ill probably be running a 28x10x15 inch tire
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Old Dec 24, 2010 | 07:08 AM
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a 15x10 with 6.5BS would probably stick out too much for you (and probably have rubbing issues on the fenders depending on ride height). myself and everyone else i know stick with the 7.5BS. and yes a 15x8 would be a 5.5BS for our cars.
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Old Dec 24, 2010 | 05:39 PM
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cool thanx for the help
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Old Dec 24, 2010 | 06:08 PM
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anyone know the center bore diameter of our cars?
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Old Dec 25, 2010 | 09:54 AM
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15x10 with 6.5 backspacing, tucked 28 10.50 undermy car under the fenders easy
i run a 15x8 with 4.5 back now and if you look hard it fluch with side of car not tucked but still lets susp. travel and no rub
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Old Dec 25, 2010 | 10:28 AM
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Mine are 15x10 with 6.5 BS

I don't have any problems with them rubbing or anything either..and I like the deeper dish on the outside of the wheel..


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Old Dec 25, 2010 | 10:30 AM
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And this is with a 10" slick

Last edited by MattSapp95_T/A; Dec 27, 2010 at 07:28 AM.
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Old Dec 26, 2010 | 02:39 AM
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first off lemme say you have a beautiful car!!!!

and those wheels do look good but im looking to tuck them alittle more.

i have a set of 15x8 with a 4.5BS and they stick out too much

they fit just like the ones in the pics
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Old Dec 27, 2010 | 01:38 AM
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ok so i have the rears figured out

so if i was to run a 15x4 up front what would the bs need to be? 1.75?
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Old Dec 27, 2010 | 07:27 AM
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Originally Posted by ls1adamls1
first off lemme say you have a beautiful car!!!!

and those wheels do look good but im looking to tuck them alittle more.

i have a set of 15x8 with a 4.5BS and they stick out too much

they fit just like the ones in the pics
Thanks!.....You will want to go with a 15x10 w/ 7.5 BS or 15x8 with 5.5 BS
Just don't get really wide tires like 325's or they will stick out worse than mine even on the 7.5 BS

Originally Posted by ls1adamls1
ok so i have the rears figured out

so if i was to run a 15x4 up front what would the bs need to be? 1.75?
Yes 1.75 will work fine
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Old Dec 27, 2010 | 10:49 AM
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Originally Posted by MattSapp95_T/A
Mine are 15x10 with 6.5 BS

I don't have any problems with them rubbing or anything either..and I like the deeper dish on the outside of the wheel..


Do you got any pics of your car from behind ??? i like the look of the 6.5 back spacing
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Old Dec 27, 2010 | 12:46 PM
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Originally Posted by Bullit95T/A
Do you got any pics of your car from behind ??? i like the look of the 6.5 back spacing
Here you go... with MT ET Streets


This is a camaro with 7.5bs (and one of my favorite camaros on this board...Matt PM me if you don't want this pic used)


now you can see them back to back....

Last edited by MattSapp95_T/A; Dec 27, 2010 at 10:40 PM.
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Old Dec 27, 2010 | 05:49 PM
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7.5 unless your rear is narrowed, those 6.5 bs wheels above stick out way too far. you can clear a 28x10.5 easily on the inside wheelwell with a 7.5" bs and the tire will actually tuck inside the wheelwell. My car is LOW and the tire sits 1/4"+ up inside the wheelwell, couldn't do that with a 6.5".
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Old Dec 27, 2010 | 05:56 PM
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Originally Posted by ls1adamls1
im in the market for some drag rims and was curious

if i go with a 15x10 what BS would i need
and if i go 15x8 waht would the BS needed.

correct me if im wrong but,
15x10 would need 7.5 BS or would a 6.5 work?
and 15x8 = 5.5 BS ????
really 490 posts and you dont know how do use the damn search button or post in the right place
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Old Dec 27, 2010 | 07:48 PM
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Never had a prob with mine clearance wise...the tires do not stick out past the rear quarter panels.. Then again I don't have my car lowered like and import either...
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Old Dec 27, 2010 | 08:53 PM
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Originally Posted by MattSapp95_T/A
Never had a prob with mine clearance wise...the tires do not stick out past the rear quarter panels.. Then again I don't have my car lowered like and import either...
LOL why'd you take down those beautiful rear end pictures??

This import inspired ride went 1.45 60' on it's 3rd pass, with something like a 6.8:1 A/F on the stock rear sway bar. Clearly I should jack my car back up and put the wrong backspaced wheels on it to improve
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Old Dec 27, 2010 | 10:16 PM
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Originally Posted by Wicked94Z
LOL why'd you take down those beautiful rear end pictures??

This import inspired ride went 1.45 60' on it's 3rd pass, with something like a 6.8:1 A/F on the stock rear sway bar. Clearly I should jack my car back up and put the wrong backspaced wheels on it to improve

LOL Well I would sure hope so with a 5600 stalled auto with 4.71 and a 389 stroker motor with aftermarket heads you would 60' in the 1.4s....
And I didn't take the "beautiful rear end pictures" down I was putting up another picture so people could see the difference....

Anyways for the OP this is a picture of my buddies car that has 7.5 Backspacing so you get an idea of what the difference is... A lot of Trans Am guys run the 6.5s however Camaros don't tuck them as well...



Another TA with 6.5 BS its really just a personal choice they both will work fine..


Last edited by MattSapp95_T/A; Dec 27, 2010 at 10:42 PM.
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