Hi all, This is my first post here on gto forum. I just bought my first GTO this week and I need some help with wheel fitment. I have checked everywhere and I havent gotten a straight answer. The car came with TSW Valencias all around. they are 18" with 245s all around. I like the look but I just think 245s are too thin. I know anything above 275s will require more intensive mods but will I be able to fit 18x9.5 with 40mm offset in the back with 275/35R18 with just some fender rolling? thanks for all the help in advance. atriot: There aren't that many options when it comes to sizes from TSW for that specific rim.