Just put on the 18 inch wheels and tires I got from Craigslist of a 2017 Sahara to replace the stock 15's. Looks fine to me but some have said it will need a body lift to use those tires.
And how will the speedometer change? New tires 31 inches tall vs. 28 inches. Thats 11% larger. If the speedometer is at 60, am I going 11% faster or slower?