Hey everyone, I've got this real helpful site for tires and wheels. If you are thinking about swaping out stocks for after market and wondering if you'll be going faster than your odometer or slower than what its displaying or wondering if your tires now spin slower or faster (depending on the swap) heres a link that will help you as it helped me a lot in the past. I love this link and would recommend it to the whole TN community.
http://www.net-comber.com/tirecalc.html
After you've decided that the wheel and tire size is what you want you can check out the offset for the car and see if it will stick out too much or not
http://www.1010tires.com/WheelOffsetCalculator.asp
this link was provided by Mistamatrix in another post but i figured i'd put these two together to save the search time.
with those two links you should have a pretty good idea of what your wheel size and offset should be (or want to be) and that way you'll save time searching for wheels instead of clicking.
I hope this helps you in choosing the right wheels that fits you and your matrix