what size tires would look nice on my jeep

Functionality is really what you should be more concerned about, but I like the looks of 33's or 35's at the most. Combined with 4.5-6" of lift.

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what size tires would look nice on my jeep
Is it stock?
If it is, the biggest tire you can expect to fit without major rubbing is 30"
My opinion is that 30s look pretty decent on most stock XJs.