I have a 96 BMW 328i with 15" rims. The current tire size on it is 205-60-15, which I beleive is the proper size. I need new tires and have a chance to pickup some very good 195-60-15 tires for extremely cheap. Since this would save me about 350 dollars I want to do it, but do not know if I can change to this size. What would this affect, if anything, if I do it?