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i have 19" CCW's on my car... they fit great and they don't feel any different than stock tires/wheels. (see sig pic)
most of the people that tell you not to get anything over a 17 or 18 have no personal experience with larger wheels and low profile tires. there is a lot of bad info out there and many things that are just not true. people have been very resistant to larger tires and wheels, but you can see that GM keeps increasing the tire diameter and widths and decreasing the sidewalls on the vettes.
basically get whatever you want, and don't listen to people that have never tried anything over a 17 or 18, cuz anything they have to say is based on assumptions and preconcieved notions.