It can be worse. I discovered (fortunately in my own driveway) that if the tire bead breaks away from the rim, the small compressor that many of us carry can't put out a sufficient volume of air to reseat it.
If you've ever watched a new tire being mounted, you've seen that the techician first uses the tire machine (the big rotary tool) to lever the tire onto the rim. Then he connects the air hose to the tire valve, holds the tire in place by hand, and sends a blast of air into the tire. With a sudden loud POP!, the tire seats itself on the rim, and from then on, everything is easy. But the little compressors can't produce that blast of air. If the tire bead has lost contact with the rim, even a little bit, you'll never get it back, no longer how long you pump.
Bill
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