I checked out the ES100 dimensional data, found on page 2 of
http://www.yokohamatire.com/pdf/avses100.pdf

205/50R15 has 6.5" Measuring Rim Width, with 5.5-7.5" Approved Rim Width.

225/50R15 has 7.0" Measuring Rim Width, with 6.0-8.0" Approved Rim Width.

So 225s will technically fit on the stock 15x6 wheels.

After reading this board, I decided to go with the 205s like everybody else; MrFatBooty knows his stuff.

On the other hand, you could try 225s and tell us the results! :thumbup: