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2012 Black Diamond CTS-V Coupe
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3,351 Posts
Discussion Starter #1
Ok so I am looking for wheels. I am trying to avoid jumping up to 19" wheels as I am not sure how that is going to work with AWD and I know there have been some issues with RWD coupes with 19" wheels.

The challenge I am having is that I am having a hard time finding wheels that are made in BOTH 18" x 8.5" AND 18" x 9".

The one tire shop said that I could get away with using an 18" x 8" wheel in front. The wheel height will be slightly higher, but according to him he says he checked with Cadillac and it shouldn't affect the AWD system.

Any thoughts?
 

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2011 cts coupe 3.6 AWD - white diamond
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45 Posts
I went with 18x8 fronts and 18x9.5 rears...was told by one of the designers of the AWD system that the width will have no effect on the system. This is assuming you are staying with the stock tires.
 

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2012 Black Diamond CTS-V Coupe
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3,351 Posts
Discussion Starter #3
McLuv1n said:
I went with 18x8 fronts and 18x9.5 rears...was told by one of the designers of the AWD system that the width will have no effect on the system. This is assuming you are staying with the stock tires.
Yes, I was going to use the stock tires. The tire shop also said that they spoke to GM engineers.
 

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2012 CTS Coupe (formerly)
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419 Posts
I have TSW 18X8 fronts and 18X9.5 rears on my coupe. I swapped the stock tires and it worked fine. As you can see by my other post, I'm actually looking to replace those tires even though there's plenty of tread left.
 

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CTS Coupe
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29 Posts
I am running staggered 19" V rims in summer and the stock 18" staggered set up that came with my AWD coupe for the winter...
 

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2012 Black Diamond CTS-V Coupe
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3,351 Posts
Discussion Starter #8
gohawks63 said:
Ok so I am looking for wheels. I am trying to avoid jumping up to 19" wheels as I am not sure how that is going to work with AWD and I know there have been some issues with RWD coupes with 19" wheels.

The challenge I am having is that I am having a hard time finding wheels that are made in BOTH 18" x 8.5" AND 18" x 9".

The one tire shop said that I could get away with using an 18" x 8" wheel in front. The wheel height will be slightly higher, but according to him he says he checked with Cadillac and it shouldn't affect the AWD system.

Any thoughts?
Well. I never heard back from Katie as she was going to check with her engineering contacts.

Because of the staggered setup, the choices are limited for the coupes if you don't want to stray from the OEM wheel and tire sizes. There are more choices if you want to go to +1 sizes.

I stayed with OEM configuration primarily because I am concerned about the AWD.

This is the only decent picture I have so far.

https://www.dropbox.com/s/y9u5d4y8xvzsalv/image.jpg
 
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