And what offset they are. The offset on one might suit the Zed better than the other
well i'm only looking at the moment. from what i've read i'll be hoping to get a set with 20 offset. so that i dont need spacers. i hear rarerims are going to be doing the rota gtrs in 19s soon. so i wanted to get them. but not sure whether should go for 8.5f/9.5r or 9f/10r if the options are available. how do i choose between the two?
Doesn't make much difference TBH. I'd recommend 245/35 front and 275/35 rear tyres and they will fit both.