Hi Brendan, fresh Lexus CT owner here from Finland. I just got a '16 model which only came with winter tires (one of the reasons I got a pretty good deal on it!), which means I should be looking for summer tires before the snow is gone. Luckily, I stumbled upon 17"x7" rims and used 225/50/17 tires which I could get for basically free.
My question is are you running the stock(?) 7" wide rims with your 225/50/17 tires? I'm a little concerned about the bulge of 225 wide tires on a 7" rim. Could you maybe share a picture? Thanks!