I want to use 15 " wheels and tires in place of the stock 16 "....HOW ?
Find rims that fit your lug pattern and width, then purchase a set of tires equal to the stock 16" in circumference and diameter. Here is the calculator......http://www.1010tires.com/Tools/Tire-Size-Calculator
A factor in down sizing is to make sure the rim fits over the caliper. When you get your new wheels, put one bare rim on the front to check for clearance. If it fits, mount the tire. Some places will not let you return rims that have had tires mounted on them.
I don't blame you, especially if your ridding the heavy corroding leaking aluminum ,costly tires, just get common ford or jeep steel with tires mounted on craiglist 235or245x 75 /15 lots, cheap money
tirerack.com...enter your vehicle info and they will give you all the rims they have (which is a lot) that fit your car, they have 15 inch jeep rims
Looking for a Used Cherokee in your area?
CarGurus has 54,518 nationwide Cherokee listings starting at $2,495.
Search Jeep Cherokee Questions
Jeep Cherokee Experts