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Old Jun 16, 2020 | 10:37 AM
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Default 21" wheels
I am considering new wheels in preparation for the cracking issue. Have 11,000 miles on my C7GS.
In doing research I have found some guys going to a 20/21" set up.
I requested the size and the recommendation for tires to prevent rubbing is to use
265/30/20
325/25/21
Anyone using this set up or have any first hand experience going with a bigger wheel?
My understanding is with this set up it will not upset any computer settings.
Thanks in advance
Last edited by Morris-108; Jun 16, 2020 at 01:15 PM.
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Old Jul 12, 2020 | 11:38 PM
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Any input?
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Old Jul 13, 2020 | 06:20 AM
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Sadly no. You're the first response. Probably just going with stock sizes for tire purpose
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Old Jul 13, 2020 | 07:31 AM
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Tire availability is what I'd be concerned about with these sizes.
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Old Jul 14, 2020 | 01:57 PM
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Your already on 20" rubber bands and an inch shorter rear tire will not help future issues with cracking and will probably make it easier with the shorter tire. I'd stay with the 19/20. I say this after 12 years in the tire/wheel business and as stated above tires will be high and it may be hard to find tires again if you ever needed one because of a blow out or puncher thats not repairable. Just my 2 cents.
Last edited by 99vetteran; Jul 14, 2020 at 01:57 PM.
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Old Jul 14, 2020 | 02:24 PM
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Agreed. I am getting forged wheels and thought the bigger wheel would fit and look nice. Then I searched for tires. LOL
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Old Jul 14, 2020 | 02:24 PM
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Originally Posted by Morris-108
Sadly no. You're the first response. Probably just going with stock sizes for tire purpose
So I just found out you CAN do it without issues as long as you use the following specs. I have seen it already online and in person.


20x10 with 275/30/20
21x12 with 325/25/21
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Old Jul 14, 2020 | 02:28 PM
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I think that 21" tire that is limited in manufacturing that is keeping me with stock sizes.
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Old Jul 14, 2020 | 02:44 PM
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Good choice Morris. Use the extra money on some new mods.
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Old Jul 15, 2020 | 01:46 PM
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If you actually drive your car, I'm curious... why would you want even less side-wall?
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Old Jul 15, 2020 | 03:51 PM
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I do drive it often but don't want less sidewall. Didn't know that was part of it. Not doing it anyway. Sticking with stock sizes
Last edited by Morris-108; Jul 15, 2020 at 03:52 PM.
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