Re: Stock height 20's
if you are concerned about wheel gap that will not change whatsoever. So as far as the gap in your wheel wells is concerned thats not gonna change from how it is now with your original wheels. Reason being is that all OEM wheel/tire combinations on all model WK2's have a total rolling diameter of almost exactly the same. So the diameter of your 18's with a thicker tire is the same as the Summits 20" wheel that has a slightly lower profile tire. Thus, your speedometer will not be effected when you switch to the Summit wheels/tires. You could even slap on SRT wheels and tires and youll be good to go. Its when you switch to other size tires that you start jazzing things up such as the speedometer.
2015 Jeep Grand Cherokee High Altitude, Bright White, V6, HK audio