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When to Replace Running Shoes

The famous mileage numbers are a rule of thumb wearing a lab coat. What the shoe feels like tells you more than what the odometer says.

In short

  • The commonly quoted range is roughly 500–800 km, but it is a wide average, not a measurement.
  • Midsole foam dies before the outsole looks worn, so appearance misleads.
  • New aches with no change in training are the strongest signal.
  • Rotating two pairs makes both last longer and is worth it once you run regularly.

The number everyone quotes is 500 to 800 kilometres, or 300 to 500 miles. It is a reasonable starting point and it is far less precise than it sounds. Body weight, running surface, gait, foam type and storage all move it substantially, and the range in real use is wide enough that treating the number as a deadline wastes money at one end and invites injury at the other.

What actually wears out

The midsole, not the tread. Foam compresses and loses its ability to rebound long before the outsole rubber looks worn through — which is why a shoe can look almost new and feel dead. People routinely keep shoes far too long because the part they can see is fine.

Better signals than mileage

  • New aches in your shins, knees or feet, with no change in your training. This is the clearest sign, and the one worth acting on.
  • The shoe feels flat — landings that used to feel cushioned now feel harsh, especially on concrete.
  • Creasing across the midsole foam, or visible compression on one side.
  • Uneven outsole wear through to the midsole in one spot.
  • One shoe feels different from the other.

Press your thumb into the midsole. Fresh foam gives and springs back. Dead foam feels dense and stays put.

Rotating pairs

Once you are running regularly, two pairs alternated will outlast two pairs used one after the other. Foam needs time to decompress between runs, and giving it a day or two recovers some of that. It also gives you a direct comparison — when your older pair suddenly feels noticeably worse than the newer one, that is the answer.

Keeping them alive

Do not put them in the washing machine or a tumble dryer; heat destroys foam and adhesive. Air-dry away from radiators and direct sun. Use the shoes for running rather than as everyday footwear, which quietly consumes their life.