[powerglide]

Has anyone tried this?

I recall seeing/reading about folks who have tried this and want to know if its a good idea.

stock deville size is 225/60/16, which equates to total tire diameter of 676 mm and circumference of 2125 mm

stock CTS size is 225/50/17, which equates to total tire diameter of 657 mm and circumference of 2063 mm

so if thats correct it means the car will sit about 19mm lower and will have an error of 62 mm/rotation.

Not sure if its a good idea....but a neighbors selling a set of his CTS rims/tires and I figures its cheaper than just buying new rubber for my old stock rims.

Any suggestions welcome.

Especially interested in photos of devilles running CTS tire/wheels if possible

 

[turbojimmy]

I wouldn't worry about the diameter - you can change that with different tire sizes. It's the width, backspacing and offset you have to worry about. See here:

http://www.rsracing.com/tech-wheel.html

Jim

 

[powerglide]

Thanks Jim.
The thing I was concerned about was the tires that are on the CTS rims right now.
I dont want to have to buy a set of tires (I am treating this like new tires with a bonus set of rims)

I did the math an it looks like it will make about 2mph difference at 75mph on the sppedo so thats ok.
Now I wonder if the 0.8 inch drop in ride height will make a difference in driveability, especially when it comes to clearing parkinglot on ramps, curbs etc

 

[turbojimmy]

Now I wonder if the 0.8 inch drop in ride height will make a difference in driveability, especially when it comes to clearing parkinglot on ramps, curbs etc

You won't really know 'til you slap them on. I switch between a 26 and 28" diameter tire on the rear GN for track duty and there's a pretty big visual difference and in the way it 'feels' when you drive it. But you've only got .8". You might feel more bumps with less rubber between you and the road, too.

Jim

 

[Young DeVille]

But you've only got .8". You might feel more bumps with less rubber between you and the road, too.

I forgot to say this in the message... But thats about the only difference.

 

[powerglide]

Alrighty...I decided to buy em.

Its a new set of 5 tires/rims.
Less than 100 miles on them, they are supposed to be almost perfect.
I'll have them sometime this week!

Thanks for the input guys.

 

[powerglide]

.....
so if thats correct it means the car will sit about 19mm lower .....

Actually I did that math wrong, its a 19mm change in diameter which means 9.5 mm change in radius, therefore the car will sit only 9.5 mm (About 1/3 of an inch) lower to the ground...hopefully negligible.

I'll find out later today!

 

[powerglide]

Well its been a long time but I finally got around to taking some pictures of my new rims/wheels.
They are the 16" from a CTS. The fit is great and the ride is wonderful. At first I wasn't sure of the new look but it has since grown on me now I love it.

Thank you all for your input.