i'm pretty sure 285s can be ran up front. i remember recently someone mentioning they were running 285s all 4 corners. but i believe they were on 18" wheels for autocross/track application.
the 20's height with 285s may be an issue but i'm not 100% since i havent seen/heard many if any people doing that or trying it.
i'm currently running 265/305 set-up on OEM sport rays with zero issues and loads of traction
