Just read "Flat Free Tires" in Countryside Mag, Vol 94, No 4. These tires (by Marathon, Carefree Tires, andTricam) are made of light polyurethane and are easy to change. They will save lots of energy that the average tire might require of you being patched.
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I'm tired of walking, and will rest for a minute and grow some wheels. This is the promise of this tiny ad:
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