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How often should you replace your running shoes?

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Some laboratory-based tests do not do a great job of replicating how shoes perform on feet in everyday life.

Some laboratory-based tests do not do a great job of replicating how shoes perform on feet in everyday life.

PHOTO: ERIC HELGAS/NYTIMES

Allessandra DiCorato

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Once you find the right pair of running shoes, it can be difficult to part with them.

It is a frequently cited rule of thumb that you should replace them after you have run about 480km to 800km in them. But buying a new pair that often can add up quickly for consistent runners.

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