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Anyone who has run for a while knows the importance of a good pair of running shoes. Once you have that, the question is.. When should I replace them? Provided you have a pair that you like and fit well, you should get anywhere from 300 - 700 miles out of them. So how do you know? Not sure for others, but I can feel the shoe starting to break down especially on my long runs. My legs will feel the pounding a little more in the later miles, I may feel the shoe roll to one side a little more than normal. One other thing I have noticed is I will have to tighten the shoe laces or quick ties periodically as the shoe seems to lose its tightness and fit around my foot. Today I bought a new pair of shoes and decided to calculate roughly how many miles I got out of my last pair. For me the number seems to be about 550 miles. Let me know what your number is?