I have a 2006 Crossfire Roadster "Special Edition" with the SRT6 Wheels on it. I picked up two of the standard 18" wheels on e-Bay as I'd like to mount snow tires on them so that I can just switch over this fall. Can I also put 18" on the rear for winter use? Will be much easier and cheaper to buy all 18" tires all the way around if I can. It looks like the 18" wheels should clear the rear calipers but I want to make sure.

 

yes 18's will work all the way around... this has been done by board/forum members.

 

I think your problems will not be in the mounting aspect. I would be more concern with the Electronic traction control, BAS/ ESP and the speedometer calibrations. I not sure if they can be recalibrated simply.
On temporary basis taking them on and off like tennis shoes, I don't feel they would pose a problem.

 

1" taller tire than stock in the rear here ... no issues.

 

I was thinking that I would put 18" all the way around for winter use and try to go at least one size narrower also as narrower tires have more bite in the snow. I certainly won't be doing any high-speed bonsai runs in the middle of a Wisconsin winter.

One thing I've learned over the years is that no matter how much something looks like it would work, ask someone who's done it. One of those lessons that I've learned the hard way so many times. Thanks

 

I wonder if the SLK's spare tire rim would work, I just don't know if its really narrow or a 7" wide rim.