There are dozens of threads and posts asking about widths of wheels, offsets, and what fits on the CRZ. I myself am shopping around for wheels and want to make sure I get a nice and flush look, without risk of rubbing. Since I was doing the math anyways, I figured I'd make a nice reference chart that can help anyone looking for a certain stance or extra wide wheels and tires.
First, determine whether you have the stock 16x6" wheels or upgraded 17x6.5" wheels. The top two charts with yellow headings show measurements compared to the 16's, and the two lower with blue headings compared to the 17's. Next, find the width of the wheel at the top of each chart, then the offset along the side. Where these two meet will be a measurement in millimeters (and inches in parenthesis) for where the edge of the chosen wheel will end up compared to your stock wheels.
There are two charts for each stock wheel size, the one on top called "Outside Measurements" tells you how wide the wheel is toward the outside fender of the car, and the lower one "Inside Measurements" is the distance that the wheel is deeper into the wheelwell, toward the middle of the car. Using these, you can measure your own vehicle to determine what will fit, and how they might look.
Please keep in mind, I am not guaranteeing whether any of these sizes will or will not fit, as I'm sure some of them won't. It will depend on your setup, if your car is lowered, how wide of tires you want to run, etc. I have included widths ranging from 6" to 10", and common offsets from +20 to +50mm. If anyone wants measurements for any other sizes not shown I'd be glad to get them for you.