I have been wondering the same thing and can't make my mind up whether to go with 20 or 18. Would like 20 but worried about how the car will ride. I found some 18" x 7.5 but I think they'll be too small. If you hear anything or have all ready gone with the 20's PLEASE let me know.Newbie here. Have a 04 Impala LS and wanting to put some 20s on? Whats the best offset to get with a 20 x 8.5 if you want them flush with the fender? I cant believe somebody hasnt asked this question. At least I couldnt find it.