I have a '03 base 5spd cooper and it will be getting new tires very soon. It is all stock, and I don't have any performance mods planned in the near future. It currently has the stock 20lb five spoke 16" wheels. It has 205/55 size tires at the moment, but I noticed while browsing online that 215/50 is an optional size. I'm just wondering if anyone has run a 215/50 and if there are any real gains to be made. I do a fair amount of "spirited" driving on twisty back roads and appreciate grippy tires. The other option I'm considering, if I can find a deal or scrape together a little more cash, is switching to light weight 15" wheels and a wide tire.