OEM wheel sizes and offsets

[mrr23]

Here is the OEM wheel specs for both the C5, C6 and C7:

Offset/Backspacing dimensions are as follows:

C4
Front (84-87) 16x8.5", 36 or 38mm offset = 6.16" backspace
Front (88-96) 17x8.5", 58mm offset = 7.03" backspace
Front (88-96) 17x9.5", 54mm offset = 7.37" backspace
Rear (84-87) 16x8.5", 36 or 38mm offset = 6.16" backspace
Rear (90-95 ZR1) 17x11", 36mm offset = 7.41" backspace
Rear (90-95 GS) 17x11", 50mm offset = 7.96" backspace


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C5 (coupe/vert):
Front 17x8.5", 58mm offset = 7.03" backspace
Rear 18x9.5" 65mm offset = 7.81" backspace

C5 Z06:
Front 17x9.5", 54mm offset = 7.38" backspace
Rear 18x10.5", 58mm offset = 8.03" backspace

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C6 (coupe/vert):
Front 18x8.5", 56mm offset = 6.95" backspace
Rear 19x10", 79mm offset = 8.61" backspace

C6 Z06:
Front 18x9.5", 40mm offset = 6.82" backspace
Rear 19x12", 59mm offset = 8.82" backspace

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C7 (coupe/vert):
Front 18x8.5", 56mm offset = 6.95" backspace
Rear 19x10", 79mm offset = 8.61" backspace

C7 Z51:
Front 19x8.5", 56mm offset = 6.95" backspace
Rear 20x10", 79mm offset = 8.61" backspace

C7 Z06:
Front 19x10", 43mm offset = 7.19" backspace
Rear 20x12", 59mm offset = 8.82" backspace

C1, C2, C3, C4, C5, C6 and C7 bolt pattern:
5 on 4.75" (120.65MM)

 

[Rich Z]

Thanks! Been pondering these figures.

But can you 'splain the difference between "offset" and "backspace"? That still confuses me. :shrug01:

 

[mrr23]

Thanks! Been pondering these figures.

But can you 'splain the difference between "offset" and "backspace"? That still confuses me. :shrug01:

Offset is the distance from the center of a wheel to its mounting flange. EXAMPLE: 10" wide wheel, a zero offset would be 5.00". + is moving the wheel inward and - means moving the wheel outward from center.

backspacing is how many inches from where the wheel mounting flange to the car all the way inward.

http://www.autoanything.com/wheels-rims/wheel-offset-vs-wheel-backspacing