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1) You aren't going to remove the old tire and mount the "spare" without the proper tools. Try it at home before you need to do it on the side of the road.
2) Re "Fix A Flat" and similar, all of the flats I've gotten in the past couple of decades - since steel belted radials became the norm - have been sidewall punctures from hitting road debris or rocks that rolled down the sides of mountains. Usually they're big enough to fit at least a couple of fingers through.
3) Cell phones aren't much use if you spend time in places where there's no cell service.
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