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Old 01-20-2003, 03:26 AM   #1
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Rims offset and backspacing?

I got some 18" rims for my car (1999 firebird) like a year ago and the offset or backspacing is not right for my car. they bolted on fine and the guy who sold them to me said they were made for a firebird, but they stick out just far enough to throw S**t all down the side of my car. So , now that I got a little more money I am going to get some new rims. But this time I want to be sure and get some that not only look good but fit my car exactly and don't stick out any. can I get 17X9 that will not stick out?

and also if anyone knows the backspacing and offset of stock wheels I would like to find that out.

also if anyone knows some good web pages to look at for rims I would like to check them out
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Old 01-20-2003, 10:36 AM   #2
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I think the offset for the stock wheels is 46mm. I am sure someone else will chime in here and verify/correct that. Just curious what wheels do you have right now? Do you have pictures of them on your car? I am looking for a set of 18s and since I do not drive my car in the rain, I may be interested in yours, but I would have to see how far they stuck out? I am looking for something agressive, but not crazy.

Later,

Aaron
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Old 01-20-2003, 12:41 PM   #3
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The stock 4th Gen wheels are 16x8, with a 55mm offset. That produces roughly a 6.65" backspace.

The stock 4th Gen wheels on athe WS6 and SS are 17x9, with a 55mm offset. That produced roughly a 7.15" backspace.

The best size for a 4th Gen, IMHO is the 17x9.5", available in a lot of places because the Corvettes used a 17x9.5" wheel. You can get "ZR1" replicas in this size for example, Torque Thrust II's, various years of Corvette wheels.

For a 17x9 or a 17x9.5" wheel, you can handle a maximum backspace of about 7.40" in the front. The ZR1 replica with a 56mm offset has that dimension and fits correctly. I can post pic's of them if you want.

You could also go as low as a 7.00" backspace on a 17x9.5" wheel. I believe that is the standard dimension recommended by ARE for the TT-II's for the 4th Gen. That is about a 45mm offset.

In the back, you can use as large as a 7.93" backspace, which corresponds to the ZR1 replica with the GS offset - 50mm, on a 17x11 wheel. That will require some inner fender massaging though.
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Old 01-20-2003, 01:13 PM   #4
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Quote:
Originally posted by Injuneer
The stock 4th Gen wheels are 16x8, with a 55mm offset. That produces roughly a 6.65" backspace.

The stock 4th Gen wheels on athe WS6 and SS are 17x9, with a 55mm offset. That produced roughly a 7.15" backspace.

The best size for a 4th Gen, IMHO is the 17x9.5", available in a lot of places because the Corvettes used a 17x9.5" wheel. You can get "ZR1" replicas in this size for example, Torque Thrust II's, various years of Corvette wheels.

For a 17x9 or a 17x9.5" wheel, you can handle a maximum backspace of about 7.40" in the front. The ZR1 replica with a 56mm offset has that dimension and fits correctly. I can post pic's of them if you want.

You could also go as low as a 7.00" backspace on a 17x9.5" wheel. I believe that is the standard dimension recommended by ARE for the TT-II's for the 4th Gen. That is about a 45mm offset.

In the back, you can use as large as a 7.93" backspace, which corresponds to the ZR1 replica with the GS offset - 50mm, on a 17x11 wheel. That will require some inner fender massaging though.
Injuneer......You the Man! I am going to print this baby out and keep it, for when I get ready to buy my new wheels. Great Info!

Do you have any recommendations for Tire Width per wheel size. For example, If I have a 17 x 9, what is the widest and narrowest tire I can put on this rim and still be ok? I have heard of some people putting 275's on a 9in. rim? If I get 17 x 9's, or 18 x9's on all corners can I put a 255 up front and a 275 in the rear?

Thanks,

Aaron
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Old 01-22-2003, 01:53 AM   #5
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Quote:
Originally posted by akrott1
Do you have any recommendations for Tire Width per wheel size. For example, If I have a 17 x 9, what is the widest and narrowest tire I can put on this rim and still be ok? I have heard of some people putting 275's on a 9in. rim? If I get 17 x 9's, or 18 x9's on all corners can I put a 255 up front and a 275 in the rear?

Thanks,

Aaron
The best thing to do for getting the correct tire width on the rim is to go to Tire Rack, and look at the specs for the specific brand tire you are going to use. A couple reasons for this:

1 - Not all manufacturers recommend the same rim width for the same size tires..... In fact, Goodyear has different rim width measurements for the same size tires in different lines. Do a search on 275/40-17 and you get the following results:

Recommend a rim width of 9-11":
-BFG
-Kumho
-Michelin
-Firestone
-Goodyear F1 Supercar

Recommend a rim width of 8.5 - 11":
-Dunlop
-Goodyear GS-C.

2 - The narrower the sidewall, the less variation is allowed in rim width. An 18 to 20" tire is much more critical on rim width than a 15-16" tire.

So, go to tire rack and read the specs. They will also show:

-outside diameter (you need to match stock)

-UTQG rating, including tread life, traction and resistance to temperature buildup

-user surveys rating things like dry traction, wet traction, cornering, noise, harshness, tread life, cornering, etc.

TIRE RACK
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Old 01-22-2003, 11:32 AM   #6
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From the Skulte website....
http://www.skulte.com/adapterfaq.html

Quote:
Various Rim Dimensions

Rim Name Size Offset Backspacing Suggested Thickness (3rd Gen)
Corvette 84-87 16x9.5 38mm 6.6" 2"
Corvette 88-96 17x9.5 56mm 7.3" 2.25"
Corvette GS ZR1 style 17x9.5 50mm 7" 2"
Corvette ZR1 style (Low Offset) 17x9.5 38mm 6.7" 2"
Corvette ZR1 style (Low Offset) 17x11 36.5mm 7.397" 1.25" Rear
Corvette ZR1 style (High Offset) 17x9.5 56mm 7.4" 2.25"
Corvette ZR1 style (High Offset) 17x11 50mm 7.93" 2" Rear
C5 Corvette 97-2000 17x8.5 front 56mm 6.8" 2"
C5 Corvette 97-2000 18x9.5 rear 63mm 7.6" 2"
C5 Corvette Z06 17x9.5 front 54mm 7.2" 2.25"
C5 Corvette Z06 18x10.5 rear 58mm 7.9" 2" Rear
Camaro 82-92 16x8 front 0mm 4.35"
Camaro 89-92 16x8 rear 16mm 5"
Camaro F1 ZR1-style 17x9 50mm 6.8" 2"
Camaro 93-97 16x8 55mm 6.5" 2"
ROH ZS 17x9.5 5 mm 5.472"
ROH ZS 17x8.5 -7 mm 4.5"

Disclaimer - These dimensions have been gotten from many sources, and are not verified. Use at your own risk. If you see an incorrect number, please let us know. The suggested thickness may not match based on offset numbers. They are based on experience fitting those specific wheels to third-gen f-bodies, and reflect feedback from customers.
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Old 12-19-2017, 05:50 PM   #7
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Re: Rims offset and backspacing?

I'm looking to get 1711wheels on my 96 Z28,will 1711with 7.97"rear spacing fit on the back?
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Old 12-19-2017, 07:50 PM   #8
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Re: Rims offset and backspacing?

Yes, but some modifications may be required. See post #9 in this "sticky" thread on the "Wheels and Tires" forum.

https://www.camaroz28.com/forums/whe...topics-312442/

An 11.0” wide wheel with 50mm offset has a 7.93" to 7.97” backspace, depending on the manufacturer.

Last edited by Injuneer; 12-20-2017 at 03:47 PM.
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