How often should you replace running shoes?
Running shoes don’t die dramatically. The outsole can look fine while the part that actually matters — the foam midsole that cushions and returns energy — has quietly gone flat and dead. Running on spent shoes is a slow, sneaky way to invite aches and injuries, so it’s worth knowing when a pair is done. Here’s the honest guidance, without trying to sell you anything.
The rough number
Most running shoes last somewhere in the range of 500–800 km (roughly 300–500 miles) before the midsole loses meaningful cushioning and rebound. That’s a wide range because it depends on you: heavier runners, aggressive foot strikes, and rougher surfaces wear shoes faster; lighter, smoother runners on soft ground get more out of them. Lightweight racing shoes — especially thin or carbon-plated ones — often wear out sooner. Treat 500–800 km as a window to watch, not a hard expiry date.
The signs it’s time
Kilometre counts are a guide; your body and the shoe tell the real story:
- New aches. Unexplained soreness in your knees, shins, hips, or feet that arrives for no other reason is one of the most common signs the cushioning is gone.
- The midsole feels flat. The shoe that used to feel springy now feels dead and hard underfoot.
- Visible compression or creasing in the midsole foam, or uneven wear through to a different-coloured layer.
- Worn-through outsole at your usual contact points.
The ache is the important one. Worn shoes rarely announce themselves visually — they announce themselves through your legs. If new niggles appear and your shoes have a lot of kilometres on them, suspect the shoes.
Why rotating two pairs helps
If you run often, having two pairs on the go and alternating them is a genuinely good idea. The midsole foam recovers some of its properties between runs when given a day to decompress, so rotated shoes tend to last longer in total. A bit of variety in shoe geometry may also spread the load across your legs slightly differently, which some runners find helps. It’s not essential — but if you’re running most days, it’s worth it.
Track it, honestly
The simplest way to stay ahead of it is to note when you started a pair and roughly how far they’ve gone, then pay attention when they enter that 500–800 km window — especially if new aches show up. Fresh cushioning is cheap insurance against the kind of overuse niggle that costs you weeks.
Worn-out shoes are one more input in the same equation everything else here lives in: staying durable enough to keep training. Liftrun can’t see your shoes — but it does read the early signs that something’s off, like a run that felt harder than it should or an ache creeping in, and those are often the nudge to check whether your trusty pair has quietly done its miles.
General guidance, not medical advice. Persistent pain warrants a professional regardless of your shoes.