hey dude, if ive got RG coilovers on my A31 running 8 inch rims in front and 9 inch on the rears.. tyres are 18"
i run 235/40/18s all around coz any bigger, the sidewall of the tyre rubs against the coilover.. even with these 235s, certain tyres rub, some don't, it depends on the sidewall profile..
im running Toyo Trampios and they're just nice, Potenzas rubbed and left rubber on the coilovers :(
hope this helps somewhat