wheel offsets
Thread Starter
Drifting
Joined: Jul 2017
Posts: 1,364
Likes: 471
From: S.E. Pennsylvania
wheel offsets
I'm getting ready to buy some new wheels for my '98 and am having trouble finding the factory OEM offset measurements. I've gone onto at least 5 different wheel vendor web sites and each has different offsets for the front and rear wheels. I don't know how critical the offset number is, but I'd like to replace my wheels with the correct OEM size.
I've seen 56mm, 58mm, 54mm, and on and on for the fronts, and 58, 61, 64, and on and on for the rears. Where can I find a definitive chart indicating correct OEM factory offset numbers for my car? And if the offsets are off by say, 2-4 mm, is this critical? I'd really just like to have the correct factory numbers... The last ones I found were from Mid America works and they were 17x8.5 front - 56mm offset - 18x9.5 rear - 61mm. TIA
BTW, posted this on the wheel forum but didn't get any replies...
I've seen 56mm, 58mm, 54mm, and on and on for the fronts, and 58, 61, 64, and on and on for the rears. Where can I find a definitive chart indicating correct OEM factory offset numbers for my car? And if the offsets are off by say, 2-4 mm, is this critical? I'd really just like to have the correct factory numbers... The last ones I found were from Mid America works and they were 17x8.5 front - 56mm offset - 18x9.5 rear - 61mm. TIA
BTW, posted this on the wheel forum but didn't get any replies...
Le Mans Master
Joined: Jul 2007
Posts: 6,092
Likes: 3,465
From: Oswego IL
17x8.5 fronts are 56mm. 18x9.5 rears are usually 64mm, but some are listed as 61, 63, and 65mm. It may vary depending on the OEM wheel model (wagon wheels, magnesiums, etc.)
No, a 2-4mm variance is not critical, especially on such narrow sizes.
No, a 2-4mm variance is not critical, especially on such narrow sizes.
Thread Starter
Drifting
Joined: Jul 2017
Posts: 1,364
Likes: 471
From: S.E. Pennsylvania
BC
Burning Brakes
Joined: Nov 2018
Posts: 980
Likes: 118
The differences are negligible. 3mm is only 1/8 of an inch, for example. That means the wheel would sit 1/8” further in or out from stock, if for example you got a 59mm offset vs 56 or something.
Last edited by Jackie N; Apr 15, 2019 at 04:00 PM.
Race Director
Joined: Jan 2000
Posts: 10,323
Likes: 3,358
From: Central TX
C5 of Year Finalist (appearance mods) 2019
Size Offset Application
17" × 8.5" +56 88-96 front/rear, 97-04 front
17" × 9.5" +54 88-96 front/rear, 97-04 front
17" × 11" +36 90-95 ZR1 rear
17" × 11" +50 96 Grand Sport rear
18" × 8.5" +56 88-96 front/rear, 97-13 front exc. C6 Z06, ZR1, Grand Sport, C7 front exc. Z51
18" × 9.5" +40 84-87 front/rear, 06-13 Z06 & Grand Sport front
18" × 9.5" +57 97-04 rear, 05-13 front
18" × 10.5" +58 97-04 rear
19" × 8.5" +56 C7 front w/ Z51
19" × 10" +40 06-13 C6 Z06, ZR1 & Grand Sport front, 427 Convertible front
19" × 10" +43 C7 Z06 or Grand Sport front
19" × 10" +56 97-04 rear
19" × 10" +79 05-13, C7 exc. Z51 rear
19" × 10.5" +42 C7 ZR1 front
19" × 11" +79 05-13 rear
19" × 12" +59 06-13 C6 Z06 & Grand Sport
20" × 10" +79 C7 rear w/ Z51
20" × 12" +59 06-13 C6 Z06, ZR1 & Grand Sport rear, 427 Convertible rear, C7 Z06/Grand Sport or ZR1 rear
17" × 8.5" +56 88-96 front/rear, 97-04 front
17" × 9.5" +54 88-96 front/rear, 97-04 front
17" × 11" +36 90-95 ZR1 rear
17" × 11" +50 96 Grand Sport rear
18" × 8.5" +56 88-96 front/rear, 97-13 front exc. C6 Z06, ZR1, Grand Sport, C7 front exc. Z51
18" × 9.5" +40 84-87 front/rear, 06-13 Z06 & Grand Sport front
18" × 9.5" +57 97-04 rear, 05-13 front
18" × 10.5" +58 97-04 rear
19" × 8.5" +56 C7 front w/ Z51
19" × 10" +40 06-13 C6 Z06, ZR1 & Grand Sport front, 427 Convertible front
19" × 10" +43 C7 Z06 or Grand Sport front
19" × 10" +56 97-04 rear
19" × 10" +79 05-13, C7 exc. Z51 rear
19" × 10.5" +42 C7 ZR1 front
19" × 11" +79 05-13 rear
19" × 12" +59 06-13 C6 Z06 & Grand Sport
20" × 10" +79 C7 rear w/ Z51
20" × 12" +59 06-13 C6 Z06, ZR1 & Grand Sport rear, 427 Convertible rear, C7 Z06/Grand Sport or ZR1 rear
Last edited by USAZR1; Apr 15, 2019 at 05:19 PM.
Pro
Joined: Jul 2012
Posts: 635
Likes: 54
From: Phoenix Arizona
Size Offset Application
17" × 8.5" +56 88-96 front/rear, 97-04 front
17" × 9.5" +54 88-96 front/rear, 97-04 front
17" × 11" +36 90-95 ZR1 rear
17" × 11" +50 96 Grand Sport rear
18" × 8.5" +56 88-96 front/rear, 97-13 front exc. C6 Z06, ZR1, Grand Sport, C7 front exc. Z51
18" × 9.5" +40 84-87 front/rear, 06-13 Z06 & Grand Sport front
18" × 9.5" +57 97-04 rear, 05-13 front
18" × 10.5" +58 97-04 rear
19" × 8.5" +56 C7 front w/ Z51
19" × 10" +40 06-13 C6 Z06, ZR1 & Grand Sport front, 427 Convertible front
19" × 10" +43 C7 Z06 or Grand Sport front
19" × 10" +56 97-04 rear
19" × 10" +79 05-13, C7 exc. Z51 rear
19" × 10.5" +42 C7 ZR1 front
19" × 11" +79 05-13 rear
19" × 12" +59 06-13 C6 Z06 & Grand Sport
20" × 10" +79 C7 rear w/ Z51
20" × 12" +59 06-13 C6 Z06, ZR1 & Grand Sport rear, 427 Convertible rear, C7 Z06/Grand Sport or ZR1 rear
17" × 8.5" +56 88-96 front/rear, 97-04 front
17" × 9.5" +54 88-96 front/rear, 97-04 front
17" × 11" +36 90-95 ZR1 rear
17" × 11" +50 96 Grand Sport rear
18" × 8.5" +56 88-96 front/rear, 97-13 front exc. C6 Z06, ZR1, Grand Sport, C7 front exc. Z51
18" × 9.5" +40 84-87 front/rear, 06-13 Z06 & Grand Sport front
18" × 9.5" +57 97-04 rear, 05-13 front
18" × 10.5" +58 97-04 rear
19" × 8.5" +56 C7 front w/ Z51
19" × 10" +40 06-13 C6 Z06, ZR1 & Grand Sport front, 427 Convertible front
19" × 10" +43 C7 Z06 or Grand Sport front
19" × 10" +56 97-04 rear
19" × 10" +79 05-13, C7 exc. Z51 rear
19" × 10.5" +42 C7 ZR1 front
19" × 11" +79 05-13 rear
19" × 12" +59 06-13 C6 Z06 & Grand Sport
20" × 10" +79 C7 rear w/ Z51
20" × 12" +59 06-13 C6 Z06, ZR1 & Grand Sport rear, 427 Convertible rear, C7 Z06/Grand Sport or ZR1 rear
Are there any matching sets of 18" front & 18" rear rims without using rear wheels on the front for a C5/C6?
Race Director
Joined: Jan 2000
Posts: 10,323
Likes: 3,358
From: Central TX
C5 of Year Finalist (appearance mods) 2019
18" × 9.5" +57 97-04 rear, 05-13 front
18" × 10.5" +58 01-04 Z06 rear
Last edited by USAZR1; May 7, 2019 at 12:52 PM.
Pro
Joined: Jul 2012
Posts: 635
Likes: 54
From: Phoenix Arizona
Sorry for any confusion, when I said “matching” I was referring to style not size. I want a narrower 18” wheel with less offset in the front and a wider 18”’ wheel with more offset in the rear. I have a bunch of 18” take-off tires I’d like to use up trying out drifting at the local track.
Last edited by clubracer23; May 7, 2019 at 10:09 PM.
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Pro
Joined: Jul 2012
Posts: 635
Likes: 54
From: Phoenix Arizona
Sorry for any confusion, when I said “matching” I was referring to style not size. I want a narrower 18” wheel with less offset in the front and a wider 18”’ wheel with more offset in the rear. I have a bunch of 18” take-off tires I’d like to use up trying out drifting at the local track.