Fixing my rear backspacing
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Joined: Apr 2006
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From: Northern, CA
Car: 1989 Iroc-Z Camaro
Engine: TBI,5.0
Transmission: Automatic 700R4
Axle/Gears: Eaton Posi,3.42,LPW Ultimate Cover
Fixing my rear backspacing
OK, decided to fix the rear backspacing on my car. Been looking at these wheels in a 15in. by 8 in. rear with a 5.5 backspacing to compliment a 295/50r15 tire. They offer a 15in. by 7in. for the front but with a 4.0 backspacing.. What do you think?

I need to fix this= Thats a 295/50r15 on a 3.75 BS rear on a 15 by 8in. wheel

I need to fix this= Thats a 295/50r15 on a 3.75 BS rear on a 15 by 8in. wheel
Last edited by Ron U.S.M.C.; Feb 19, 2010 at 08:33 PM. Reason: add info.
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From: morrow, ga
Car: 82 S10, 83 280ZX, 84 Z28
Engine: 355 smallblocks..na, 2.8 turbo
Transmission: 85:th350, 84:700R4
Axle/Gears: 85:ford9 4.85, 84:stock 3.24
Re: Fixing my rear backspacing
those "prostar" look-a-likes are nice looking but even heavier than a stock aluminum wheel. i highly recommend the Weld prostars. with a 8" wheel 4" backspace looks good. i guess you have a 3rd gen rear? also that 295 50 15 will look better on a 10" wide rim.
Thread Starter
Supreme Member
Joined: Apr 2006
Posts: 4,482
Likes: 10
From: Northern, CA
Car: 1989 Iroc-Z Camaro
Engine: TBI,5.0
Transmission: Automatic 700R4
Axle/Gears: Eaton Posi,3.42,LPW Ultimate Cover
Re: Fixing my rear backspacing
Yes that's a 3rd gen rear. When I first started fixing up this car I really had no idea about back spacing so just went with a wheel I liked. Turned out to only be offered in a 3.75 bs for a 15 by 8 in wheel. So Ive decided to get it fixed. I did some measuring with a tape and looks as if I am going to need the extra 1.75 that a 5.5 bs offers to get that 295/50r15 tire to fit.So I its going to be 15x8 ,5.5bs with 295/50r15s
Last edited by Ron U.S.M.C.; Dec 22, 2010 at 05:09 PM. Reason: add info.
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iTrader: (2)
Joined: Jul 2009
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From: morrow, ga
Car: 82 S10, 83 280ZX, 84 Z28
Engine: 355 smallblocks..na, 2.8 turbo
Transmission: 85:th350, 84:700R4
Axle/Gears: 85:ford9 4.85, 84:stock 3.24
Re: Fixing my rear backspacing
i would go 15x10 with 5.5" bs. here is a pic of mine but its a 4th gen rear. 15x10 with 7.5" bs. could have tucked it in more with 8.5" bs and some hammering but still looks good.
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iTrader: (2)
Joined: Jul 2009
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From: morrow, ga
Car: 82 S10, 83 280ZX, 84 Z28
Engine: 355 smallblocks..na, 2.8 turbo
Transmission: 85:th350, 84:700R4
Axle/Gears: 85:ford9 4.85, 84:stock 3.24
Re: Fixing my rear backspacing
sorry its not the greatest pic
Thread Starter
Supreme Member
Joined: Apr 2006
Posts: 4,482
Likes: 10
From: Northern, CA
Car: 1989 Iroc-Z Camaro
Engine: TBI,5.0
Transmission: Automatic 700R4
Axle/Gears: Eaton Posi,3.42,LPW Ultimate Cover
Re: Fixing my rear backspacing
I decided to go with a 15 by 8in. rear wheel . Dose any one else have photos of a 15 by 8in. wheel with a 5.5 bs. and maybe a 295/50r15 tire would be nice?
Last edited by Ron U.S.M.C.; Dec 22, 2010 at 05:07 PM.
Thread Starter
Supreme Member
Joined: Apr 2006
Posts: 4,482
Likes: 10
From: Northern, CA
Car: 1989 Iroc-Z Camaro
Engine: TBI,5.0
Transmission: Automatic 700R4
Axle/Gears: Eaton Posi,3.42,LPW Ultimate Cover
Re: Fixing my rear backspacing
OK, Decided to go with the Weld Prostars.Still would like to see some photos please.
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Supreme Member
iTrader: (2)
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From: morrow, ga
Car: 82 S10, 83 280ZX, 84 Z28
Engine: 355 smallblocks..na, 2.8 turbo
Transmission: 85:th350, 84:700R4
Axle/Gears: 85:ford9 4.85, 84:stock 3.24
Re: Fixing my rear backspacing
here is some more pics of mine if that helps any. the closest interference is the bump-stop area and maybe the LCA
Supreme Member
iTrader: (2)
Joined: Jul 2009
Posts: 1,354
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From: morrow, ga
Car: 82 S10, 83 280ZX, 84 Z28
Engine: 355 smallblocks..na, 2.8 turbo
Transmission: 85:th350, 84:700R4
Axle/Gears: 85:ford9 4.85, 84:stock 3.24
Re: Fixing my rear backspacing
and one more
Thread Starter
Supreme Member
Joined: Apr 2006
Posts: 4,482
Likes: 10
From: Northern, CA
Car: 1989 Iroc-Z Camaro
Engine: TBI,5.0
Transmission: Automatic 700R4
Axle/Gears: Eaton Posi,3.42,LPW Ultimate Cover
Re: Fixing my rear backspacing
No the Weld Prostars are going to have to wait until after moneys not so tight. I am going to put some 255/60r15 on the rear when the 295/50r15 need replacing. That will bring in the rears at least 1in.each side, then I'm thinking 4.5 bs on a 8in. wheel in order to get the full 1.75 needed to bring them in with the 255/60r15 tire. Its just that Ive been looking at some of the other cars here and a slightly thinner tire looks pretty good . Anyway a 255/60r15s not all that thin.
Last edited by Ron U.S.M.C.; Feb 26, 2010 at 06:46 PM. Reason: add info.
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From: Bertram (outside Austin), TX
Car: 87 GTA
Engine: L98
Transmission: 700R4
Axle/Gears: Dana M78 3.27 posi
Re: Fixing my rear backspacing
Whe I had 9" rears, I had 5" bs with plenty of room inside & they were in from the fender lip by about 1/2" - 3/4".
Going to 11" with 7" bs, I had to a "little" bit of cutting & hammer work, but it was WELL worth the extra work.
Don't go down to a "weenie" 255 in the rear. You'll regret it!
Going to 11" with 7" bs, I had to a "little" bit of cutting & hammer work, but it was WELL worth the extra work.
Don't go down to a "weenie" 255 in the rear. You'll regret it!
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iTrader: (2)
Joined: Jul 2009
Posts: 1,354
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From: morrow, ga
Car: 82 S10, 83 280ZX, 84 Z28
Engine: 355 smallblocks..na, 2.8 turbo
Transmission: 85:th350, 84:700R4
Axle/Gears: 85:ford9 4.85, 84:stock 3.24
Re: Fixing my rear backspacing
at least a 275mm
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