AndyM, are you concerned about the fact that the OEM spare is not the same diameter as the 275/55R20s? I have heard different opinions about the need for all 4 wheels to be the same diameter, or else the 4WD system could be damaged. This would occur if you had to use the OEM spare.
Nope. Not concerned one bit. It's not that much of a difference. Plus, the tires are never spinning at the same rate anyway everytime you go around a corner. That's what differentials are for. I wouldn't drive it like that for long in the unlikely event that I did get a flat, but to the next gas station - sure - I don't have a problem with that.
Thanks! I really like them so far. They are quiet and handle well - very little difference from the Goodyears. I don't notice any degredation in acceleration or braking performance. In fact, it almost feels better with these tires. Heading out to the desert this weekend to see how they do in the dirt.
Tires did really well last weekend. Towed my toy-hauler out to the desert with a full load and the Jeep tracked well and rode great the entire way. Did well in the sand and hooked up much better than the stock Goodyears. Had some rain on the way home and had to back up a steep, wet driveway. No problems at all in 4wd low. The stock tires couldn't push the trailer up that driveway even when dry. Hit some mud too and these tires worked great! They had plenty of traction and cleared out quickly. Very pleased overall!