My wife bought 2 bikes from garage sales and I fixed them up, oiled them put air in the tires. And on the maiden voyage the front tire popped before I got on. It wasn't over inflated, just an old tire. I saw these online and had my doubts and questions. I went into the store, and saw it. It is basically a solid hard foam rubber insert that is the shape of an inflated inner tube. I bought in and installed it in under 2 minutes. Actually I bought enough for all the tires and replaced all at once. They are very solid, have good give, and are very supportive. You CAN NOT puncture them, because it is solid foam. They ride very smooth, and no worries. I highly recommend them to everyone and anyone. I bike daily, when I can get out to get a good pump on my legs, and I ride over questionable terrain. There aren't ANY sidewalks within a mile of where I live, so it is the roads for me with all its potholes and occasional glass. Anyway... good tire fix... get them.
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