These would be awesome on the S.
They are 21's but not the right width by 1 cm.
http://www.foxnews.com/leisure/2013/07/24/pirelli-creates-run-silent-tires-for-high-end-audis/?cmpid=app_pulse
They are 21's but not the right width by 1 cm.
http://www.foxnews.com/leisure/2013/07/24/pirelli-creates-run-silent-tires-for-high-end-audis/?cmpid=app_pulse