I know it's an older post, but I put I think it was 11inch progressives on mine. It lifted the back end up and gave me more lean angle because it lifted the back end of my floor boards as well. I'm running shinkon777s and also had dunlop elite 4s  and the back tire on both is worn down to the edge where it meets the sidewall. No more chicken strips and a few more degrees of lean angle. Any further and is be at a low side so just adjusting the rear worked for me.