Well first thing is what is your engine? If you have the Hemi the smallest wheel that will clear the brakes is the 18 inch. If you have the pentastar I believe the smallest you can do is a 17 inch. I maybe mistaken on the 17 inch but if you have the hemi due to the HD brakes anything under 18 will not fit.
2011 Stone White Grand Cherokee Laredo E, ORA1, QT2, Factory Trailer Tow, 3m FX 15% Tint.
1998 Wrangler Sahara 10inch skyjacker lift, 38x14.50 TSL
2005 Grand Cherokee Limited, 5.7, QD2