Who said the r888s were for street driving? They're for track days I do here and there. Otherwise I use the stock rays (or another car) year round. And they are absolutely not super stretched. Using the ideal tire/rim width calculator (
Car Bibles : The Wheel and Tyre Bible Page 4 of 4) the 275/40r18 can go on anywhere from a 9-10.5in rim. Not saying 10.5 is a perfect size but it's not stretching a 255 onto an 11in rim. Still feel as if you're blowing it out of proportion.