I don't know much about tires, but I have 225/40/R18 Hankooks. I want a little taller of a wall. If I go with 45 will that still fit the rim fine?
I know the width (225) and radius (18) can't be changed without changing rims, but can the height (40) be changed to a 45 without new rims or any problems?
I seriously have to answer your question with a question. The sidwall of that "40" in the code is the profile of the tire and with the exception of comfort, the lower, the better -- why would you want to change it?
The lower the profile, the less flexing the tire has from side to side, which is better for handling. The ride is bumpier but stiffer is better - ask the wife! ;)
ps. if you're tossing 18 inch 40 profile 225mm hankooks to change your tires, i imagine there is quite a few people to buy your tires if they're in good shape.
The problem is that there is too much room between the tire and the wheel well on my Stratus. It looks awkward. Other than that, the bumps aren't too bad with the 40. I imagine it would be even better with 45.
I'll gladly sacrifice handling for a better look and better ride. They are in great shape, just looking to trade with someone local who has 22/45/18 on Craigslist.