I have to agree with Neil on this one. Like I mentioned in the "air down or not" thread I once had two flat tires in Big Bend state park. Luckily they were jsut punctured tires and I was able to plug a hole with a large screw to get of the trail. But in case of a ripped side wall, the next decent town close enough to carry a larger variaty of tires is Fort Stockton. That's far over a hunderd miles not taking into account an other possible two hours to get of the trail. I do see the need for something the carry a full size spare.