I don't want smaller tires, but didn't know the difference btwn what I have and the 275's, since the numbering sequence is different. So if you're saying that the 275's are smaller than the 30x9.5.15's, then you're right and I will stick with the 30's. I certainly don't want to go smaller, but got tempted by the rim/tire combo. I don't intend to keep this '92 for long, and simply want to make sure it has safe equipment on board. The current tires sat on the tarmac at Naval Station 32nd St in San Diego for over 2 years after returning from Bahrain, Spain, and Iraq (the Jeep traveled abroad). The current tires have flat spots which make it ride poorly, and I am using the temp spare on one corner, so I just want to bring it up to speed.