I bought new tire for road bike at the bicycle shop. The reason why the tire which be using now is old. It was about ten years old. So, it had some crack. And, perhaps, the rubber of the material changed to hard by long years.I select wide and soft tire. The width was 25mm. the old one was 23mm. The resist will be large. But, it must be stable, and the performance of stop must be better.
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