Whats the difference between running 225/60/15 and 225/55/16? except for less tire sidewall and more allow rim, does it actually improve handling? and if so how? because they are all 225's and I would think that sidewall of the tire does not matter in handling. how about 17 inch rims? 235? it's only 10mm wider, how much handling could that REALLY improve? I hear that the smallerthe sidewall is the better handling you get, but i don't believe it, I think that it has to do with the width of the tire.