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On every vehicle sold in the US, there is a sticker - commonly called the placard - that will list the original tire size and the vehicle manufacturer's specified pressure for that size. The placard is usually located on a doorpost or in the glove box, but sometimes it is located in the trunk or on the fuel filler door.
My book does not list a Jeep ZJ, and the listings for Jeep CJ's list quite a lot of different tires sizes as original. What do not want to do is go smaller in load carrying capacity. That increases the risk of a load related tire failure - which sometimes has tragic consequences. So if your placard says the original tire size is a 225/70R15, do not use a 215/70R15.
Not to mention that you'll get better fuel economy with a larger tire.
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