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What backspacing do I need?

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Old Dec 29, 2005 | 01:52 PM
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faulball67's Avatar
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From: Columbus, GA
Car: 1986 IROC Z28
Engine: 350 carbed
Transmission: TH350
Axle/Gears: 3.43
What backspacing do I need?

I was looking at getting a set of weld racing draglite's just for my slicks. I'm planning on running 275/60/15 Hoosier drag radials. I was going to use a 15x9 rim but they only come in a 5.5" backspacing. I need to know if this will work without any problems. If it is a problem I will switch to a 15x10. What backspacing would I need to run these without having to do modifications in the wheel wells? I'm only talking about the rear tires.
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Old Dec 29, 2005 | 05:45 PM
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From: Changing Tires
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I run 9.5" wide with 5.5" backspacing no problems. Have you tried a search? Try something like "*x10 backspace" or "*x9 backspace" and you'll get all kinds of answers for specifically 9" and 10" wide.
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Old Dec 29, 2005 | 05:53 PM
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From: Columbus, GA
Car: 1986 IROC Z28
Engine: 350 carbed
Transmission: TH350
Axle/Gears: 3.43
yeah but I never came up with anything definitive. It was always guys talking about diifferent sizes than what I'm looking for.
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Old Dec 29, 2005 | 07:17 PM
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From: Columbus, In
Car: 87 Camaro
Engine: 406
Transmission: T56
Axle/Gears: 9" ford 35 spline axles
5.5 backspacing will tuck the tires in better. You will have to do some minor inner fender wheel massaging at the front. with that size tire you could even go with a 15x8. I had 15 x8 drag stars with 295/50/15 tires. I now have 15x10 for the strip. I have also read that 15x8 with 4.5 bs will work, but from the pics ive seen the stick out too far for my taste. hope this helps
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Old Dec 29, 2005 | 10:27 PM
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From: Columbus, GA
Car: 1986 IROC Z28
Engine: 350 carbed
Transmission: TH350
Axle/Gears: 3.43
I already have a set of 15x8's on the back. I checked summit and the recommended rim width was 8-10. I just think it will look like crap, and would imagine that having a smaller rim would cause a loss of contact patch comared to a 10. I'll probably wind up with the 15x10's anyway since it's only a few bucks more. Like $15 more per rim.

So what kind of work am I looking at doing to the fender well to fit a 15x10 in? Just a little torch heat and and mallet, or cutting away and welding in some new metal.

Last edited by faulball67; Dec 29, 2005 at 10:36 PM.
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Old Dec 30, 2005 | 06:05 AM
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From: Columbus, In
Car: 87 Camaro
Engine: 406
Transmission: T56
Axle/Gears: 9" ford 35 spline axles
just a big malet or hammer to the front inside. i removed bump stop also. it would rub if the car was jacked up. what backspacing are the 15x8 wheels you have now?
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Old Dec 30, 2005 | 01:33 PM
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From: Columbus, GA
Car: 1986 IROC Z28
Engine: 350 carbed
Transmission: TH350
Axle/Gears: 3.43
Not sure. They were already on the car when I bought it. How do I measure it?
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Old Dec 30, 2005 | 01:36 PM
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From: Columbus, In
Car: 87 Camaro
Engine: 406
Transmission: T56
Axle/Gears: 9" ford 35 spline axles
take a stright edge and lay it across the wheel. then measure from there to where the wheel mounts.
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Old Jan 3, 2006 | 09:34 PM
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You will probly have to deflate the tire to do this. Make shure the strait edge touches both ends of the rim
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