I have 205/40ZRs on my 17" rims and the offset is 38 or 42...? It is a proper plus size for an escort. Mine is lowered 1.8". If you want to go with 17s or 18s, I rec. "rolling" the rear lip for tire clearance and peace of mind. I can easily get a finger width between when at rest; considering spacing a little wider. If you were to go with the 18s, I believe a set of 205 or 215/35R18 will fit with a proper offset. Are you still at stock height or plan on lowering?