need a spare for your JK? I have one 18" rim and tire off a Sahara (I think) that has a Bridgestone Dueler tire. The rim is very good with no rash and has the center Jeep hub. The tire looks to have about 15-20K of wear and has a plug where it was fixed at some point. I would think it would be a very competent spare tire or ditch it and keep just the rim.
I don't know how to post a pic here, but if you PM me I can email you some pics. price is $15 plus Greyhound shipping (it;s cheap and amazingly fast!)