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by grogenaut
2031 days ago
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your shoe rubber is going to be a totally different makeup than car tires. I'm not a rubber chemist so I can't say which is worse. Running in car tires would be like running in hard soled work boots. Also I'm betting that < 1% of the population runs as much as you, whereas > 1% of the population has a car or ridses in motorized vehicles using rubber tires. |
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