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Old Dec 16, 2020 | 10:25 PM
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Default New Wheels
Need help. Want to put new wheels on C5. Original rear is 18x9.5 with +65 offset. New wheels are 18x9.5 with +57 offset. Want to keep same size tires of 275/40zr18. Will these work?
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Old Dec 16, 2020 | 11:38 PM
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Old Dec 17, 2020 | 07:43 AM
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I would ask a tire store in your area, perhaps ask two stores, and see they tell you the same answer!
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Old Dec 17, 2020 | 09:56 AM
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You're talking about a difference of 8mm. That means the new wheel will sit 8mm further outside the rear wheel well from the existing setup.

It will be fine. No need to call anyone.
Last edited by Stingroo; Dec 17, 2020 at 07:49 PM.
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Old Dec 17, 2020 | 03:34 PM
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I never understood why GM used two rear wheels of the same width, with the same tire size, but different offsets. Seems a little strange.
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Old Dec 17, 2020 | 03:41 PM
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Originally Posted by USAZR1
I never understood why GM used two rear wheels of the same width, with the same tire size, but different offsets. Seems a little strange.
but is it GM doing this, or is it the wheel manufacturers?
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Old Dec 17, 2020 | 04:14 PM
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Originally Posted by djohn3853
but is it GM doing this, or is it the wheel manufacturers?
I'm sure GM specified what they wanted and the manufacturer built them to that spec.
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Old Dec 17, 2020 | 06:04 PM
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Originally Posted by USAZR1
I'm sure GM specified what they wanted and the manufacturer built them to that spec.
Maybe that size/offset pattern is stock on another GM vehicle. and it's close enough for c5. Don't know, just guessing.
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Old Dec 17, 2020 | 07:34 PM
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Originally Posted by Stingroo
You're talking about a difference of 8mm. That means the new wheel will sit 8mm further inside the rear wheel well.

It will be fine. No need to call anyone.
It will actually be 8mm out.
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Old Dec 17, 2020 | 07:48 PM
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Originally Posted by jamieo
It will actually be 8mm out.
You're right. I wasn't paying super close attention this morning. lol
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Old Dec 17, 2020 | 07:50 PM
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Originally Posted by djohn3853
Maybe that size/offset pattern is stock on another GM vehicle. and it's close enough for c5. Don't know, just guessing.
No, it's not.
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Old Dec 17, 2020 | 07:53 PM
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If I had to choose between the two offsets, I would choose the +57 on a 9.5" width wheel. If the wheel was 11" wide, my preference would be the +65.
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