Go to
www.tirerack.com, put in your car, and select a winter tire/wheel package. There should be a 14" option and you'll see some available tire size.
I know on my car they wouldn't sell me less than 215's for width because of the load rating of my car (I wanted narrower.. I'm sure it could be done) and I was able to move up to a 55 profile on 16" rims (couldn't go smaller because thats all that fits over the brakes. They won't offer smaller than you can go).