My girlfriend has got a 2002 Mitsubishi Mirage. It has 4 lugs on the tire, but when I am looking at rims i rarly see just 4 lug i see like 4x114.3 or something along those lines. I do not know what this means. I think I need to know the diameter of her wheels. I do not know anything about doing this sort of thing, can anyone help me?

 

4x114.3 is the bolt pattern.. 114.3mm is the lug spacing. You just need to find out what bolt pattern her cas has, that has nothing to do with the diameter of the wheel. 4x114.3 and 4x100 are the most common 4 lug patterns.