Question on stock C5 wheel offset
Thread Starter
Drifting
Joined: Mar 1999
Posts: 1,760
Likes: 12
From: Clemson, SC God's Country!!
Cruise-In I Veteran
Question on stock C5 wheel offset
Does anyone know the proper offset for a stock C5 front and rear wheel? My source is telling me 56mm front and 57mm rear but I want to be sure. I know there are some folks on here that can tell me for sure. Thanks in advance.
Race Director
Joined: Oct 2002
Posts: 16,477
Likes: 26
From: Gone
CI 6-7-8-9-10 Veteran
St. Jude Donor '03
C5:
Front 17x8.5 - 58mm
Rear 18x9.5 - 65mm
Z06:
Front 17x9.5 - 54mm
Rear 18x10.5 - 58mm
Note as soon as you change the width of the wheel, these offset numbers become somewhat useless. Meaning an 11" wheel should not have the same offset as a 9" wheel.
The 56 and 57mm offsets you mentioned will be just fine if they are stock width (or close) wheels....the stock C5 wheels were too "tucked in" anyways, there's quite a bit of wiggle room there to push them out more, which is what less offset will do.
If you have a specific wheel size in mind, post it, I can tell you exactly how it will fit the car.
Front 17x8.5 - 58mm
Rear 18x9.5 - 65mm
Z06:
Front 17x9.5 - 54mm
Rear 18x10.5 - 58mm
Note as soon as you change the width of the wheel, these offset numbers become somewhat useless. Meaning an 11" wheel should not have the same offset as a 9" wheel.
The 56 and 57mm offsets you mentioned will be just fine if they are stock width (or close) wheels....the stock C5 wheels were too "tucked in" anyways, there's quite a bit of wiggle room there to push them out more, which is what less offset will do.
If you have a specific wheel size in mind, post it, I can tell you exactly how it will fit the car.
Melting Slicks
Joined: May 2002
Posts: 3,161
Likes: 8
From: Beverly Hills Florida
CI 7-8 Veteran
Originally Posted by Vettin Man
Does anyone know the proper offset for a stock C5 front and rear wheel? My source is telling me 56mm front and 57mm rear but I want to be sure. I know there are some folks on here that can tell me for sure. Thanks in advance.
Thread Starter
Drifting
Joined: Mar 1999
Posts: 1,760
Likes: 12
From: Clemson, SC God's Country!!
Cruise-In I Veteran
Originally Posted by Y2Kvert4me
C5:
Front 17x8.5 - 58mm
Rear 18x9.5 - 65mm
Z06:
Front 17x9.5 - 54mm
Rear 18x10.5 - 58mm
Note as soon as you change the width of the wheel, these offset numbers become somewhat useless. Meaning an 11" wheel should not have the same offset as a 9" wheel.
The 56 and 57mm offsets you mentioned will be just fine if they are stock width (or close) wheels....the stock C5 wheels were too "tucked in" anyways, there's quite a bit of wiggle room there to push them out more, which is what less offset will do.
If you have a specific wheel size in mind, post it, I can tell you exactly how it will fit the car.
Front 17x8.5 - 58mm
Rear 18x9.5 - 65mm
Z06:
Front 17x9.5 - 54mm
Rear 18x10.5 - 58mm
Note as soon as you change the width of the wheel, these offset numbers become somewhat useless. Meaning an 11" wheel should not have the same offset as a 9" wheel.
The 56 and 57mm offsets you mentioned will be just fine if they are stock width (or close) wheels....the stock C5 wheels were too "tucked in" anyways, there's quite a bit of wiggle room there to push them out more, which is what less offset will do.
If you have a specific wheel size in mind, post it, I can tell you exactly how it will fit the car.
Race Director
Joined: Oct 2002
Posts: 16,477
Likes: 26
From: Gone
CI 6-7-8-9-10 Veteran
St. Jude Donor '03
Originally Posted by Vettin Man
I am using 17X8.5 in front and 18X9.5 in rear. I think the offsets are going to be 56 and 57 but I am still checking with the wheel guy. Thanks for the input.
Offset becomes critical when pushing the width envelope, but you aren't doing that.
As I steted before, with stock width wheels, there's lots of room to play with, and a slightly lesser offset will actually look better on the car.
Drifting
Joined: Jan 2005
Posts: 1,590
Likes: 5
From: Forsyth Illinois
Originally Posted by Y2Kvert4me
If that's the case, you'll have no problem whatsoever.
Offset becomes critical when pushing the width envelope, but you aren't doing that.
As I steted before, with stock width wheels, there's lots of room to play with, and a slightly lesser offset will actually look better on the car.
Offset becomes critical when pushing the width envelope, but you aren't doing that.
As I steted before, with stock width wheels, there's lots of room to play with, and a slightly lesser offset will actually look better on the car.
I don't know the proper offset to have? Will the rears stick out past the fenders, Look strainge?
Thanks, Mark
Race Director
Joined: Oct 2002
Posts: 16,477
Likes: 26
From: Gone
CI 6-7-8-9-10 Veteran
St. Jude Donor '03
Originally Posted by VET IT B
I looking at new 2000 thin spokes 17x9.5 front and 18x10.5 rears on a 2000 C5 Vert. I want to get new tires 275/40/17 front and 315/35/18 rears. I know the diam. will be ok compared to stock.
I don't know the proper offset to have? Will the rears stick out past the fenders, Look strainge? Thanks, Mark
I don't know the proper offset to have? Will the rears stick out past the fenders, Look strainge?
Thanks, Mark
Racer
Joined: Nov 2016
Posts: 351
Likes: 13
From: Payson AZ
Can you use the stock 18 x 9.5 with a stock 275/45-18 tire fit on the front?
You would have 4 of the same wheels and tires on all four corners?
My EBCM does not work anyways so the 1" size recommendation don't matter maybe?
You would have 4 of the same wheels and tires on all four corners?
My EBCM does not work anyways so the 1" size recommendation don't matter maybe?
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Melting Slicks
Joined: Feb 2001
Posts: 2,791
Likes: 355
From: Northville, MI
Congrats on finding the record update thread. To answer your question you can fit the 275's on 18x9.5 rims. However you would be better suited to find 275x35/18 tire, their diameter is 25.6" vs 27.7" for the 45 aspect ratio. otherwise you will have another 1/2" fender clearance above the wheels showing----the 4x4 look
Pro
Joined: Apr 2017
Posts: 590
Likes: 134
From: Hanover Maryland
Congrats on finding the record update thread. To answer your question you can fit the 275's on 18x9.5 rims. However you would be better suited to find 275x35/18 tire, their diameter is 25.6" vs 27.7" for the 45 aspect ratio. otherwise you will have another 1/2" fender clearance above the wheels showing----the 4x4 look
Bingo, 275/45 is a huge sidewall.
Racer
Joined: May 2019
Posts: 316
Likes: 21
From: Michigan
I am looking at buying these rims, I already have tires from previous 18" rims. The catch to the rear is that I have added the Z06 air duct work to my Base model 2002 vette. Any issues in rubbing in the rear on the air ducts? I believe my previous rims are 18x9.5, they do not rub. I will have to check for the offset on those.
Front 245-40-18 with a 18x9.5 rim with a 56 offset
Rear 285-35-18 with a 18x10.5 rim with a 56 offset
Front 245-40-18 with a 18x9.5 rim with a 56 offset
Rear 285-35-18 with a 18x10.5 rim with a 56 offset
Racer
Joined: May 2019
Posts: 316
Likes: 21
From: Michigan
I am looking at buying these rims, I already have tires from previous 18" rims. The catch to the rear is that I have added the Z06 air duct work to my Base model 2002 vette. Any issues in rubbing in the rear on the air ducts? I believe my previous rims are 18x9.5, they do not rub. I will have to check for the offset on those, I believe they are +56.
Front 245-40-18 with a 18x9.5 rim with a +56 offset
Rear 285-35-18 with a 18x10.5 rim with a +56 offset
Front 245-40-18 with a 18x9.5 rim with a +56 offset
Rear 285-35-18 with a 18x10.5 rim with a +56 offset
Instructor
Joined: Sep 2020
Posts: 202
Likes: 39
From: SACRAMENTO
I am looking at buying these rims, I already have tires from previous 18" rims. The catch to the rear is that I have added the Z06 air duct work to my Base model 2002 vette. Any issues in rubbing in the rear on the air ducts? I believe my previous rims are 18x9.5, they do not rub. I will have to check for the offset on those, I believe they are +56.
Front 245-40-18 with a 18x9.5 rim with a +56 offset
Rear 285-35-18 with a 18x10.5 rim with a +56 offset
Front 245-40-18 with a 18x9.5 rim with a +56 offset
Rear 285-35-18 with a 18x10.5 rim with a +56 offset
Drifting
Joined: Mar 2018
Posts: 1,364
Likes: 414
From: New Jersey
I have the real Z06 ducts on my 04 convertible and have C6 19x10 rims using a 20mm spacer. The offset becomes similar to what you are proposing. The rim is half inch wider so the outside of the time would be 1/4 inch closer to the ducts. I have about an inch or so clearance between the wheel and the duct. So I think it would fit.
3rd Gear
Joined: Nov 2025
Posts: 3
Likes: 0
C5:
Front 17x8.5 - 58mm
Rear 18x9.5 - 65mm
Z06:
Front 17x9.5 - 54mm
Rear 18x10.5 - 58mm
Note as soon as you change the width of the wheel, these offset numbers become somewhat useless. Meaning an 11" wheel should not have the same offset as a 9" wheel.
The 56 and 57mm offsets you mentioned will be just fine if they are stock width (or close) wheels....the stock C5 wheels were too "tucked in" anyways, there's quite a bit of wiggle room there to push them out more, which is what less offset will do.
If you have a specific wheel size in mind, post it, I can tell you exactly how it will fit the car.
Front 17x8.5 - 58mm
Rear 18x9.5 - 65mm
Z06:
Front 17x9.5 - 54mm
Rear 18x10.5 - 58mm
Note as soon as you change the width of the wheel, these offset numbers become somewhat useless. Meaning an 11" wheel should not have the same offset as a 9" wheel.
The 56 and 57mm offsets you mentioned will be just fine if they are stock width (or close) wheels....the stock C5 wheels were too "tucked in" anyways, there's quite a bit of wiggle room there to push them out more, which is what less offset will do.
If you have a specific wheel size in mind, post it, I can tell you exactly how it will fit the car.
