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A couple of factors from my own experience are: Pronation - I over-pronate slightly, so the outside of my heel gets worn down more quickly than the inside. When it wears past a certain point, I f...
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A couple of factors from my own experience are: Pronation - I over-pronate slightly, so the outside of my heel gets worn down more quickly than the inside. When it wears past a certain point, I f...