When to Replace Your Running Shoes
A running shoe usually dies from the inside, where you cannot see it. The midsole foam compresses with every kilometre and stops returning energy long before the upper looks worn. That is why a pair can look almost new and still be finished for running.
The mileage answer
Most midsoles are considered spent somewhere between 500 and 800 kilometres. Where you land in that range depends on a few things:
- Weight. A heavier runner compresses foam faster.
- Surface. Road and concrete are harder on a midsole than trail or track.
- The shoe. Lightweight racing foams are deliberately soft and wear out sooner; firmer daily trainers last longer.
If you do not track distance, time is a rough substitute: someone running three times a week is usually in that window somewhere between eight and twelve months.
The signs that matter
Press the midsole
Push a thumb into the foam under the heel. Fresh foam compresses and springs back. Spent foam feels dead, gives less, and returns slowly. Compare left against right, and against a newer pair if you have one.
Read the outsole, not the upper
Wear at the outer heel and under the forefoot is where a runner lands and pushes off. Deep smoothing in those two places means real mileage. An upper in good condition tells you nothing about how much running is left.
New aches
Shin, knee or hip discomfort appearing without a change in training is a common sign the cushioning has gone. It is the least precise signal here and often the first one people actually notice.
Buying a used pair
The obvious question with second-hand running shoes is how much life is left, and you cannot know the previous mileage. So read the shoe instead: check the outsole at the heel and forefoot, and look at the midsole for deep creasing along its side, which indicates compression that has already happened.
A pair past its running life is not finished — it is simply finished for running. Plenty of them have years left as walking, gym or everyday shoes, and they are priced accordingly. Our running shoes listings state the condition grade and show the actual pair, so you can judge the outsole yourself before ordering.