When should you replace your running shoes?

At some point, you have to replace your trust old running shoes. But when exactly is that? A quick google search will usually give you a number between 500 - 1000 kilometers. But is that even accurate? And is there a magic kilometer count for when your running shoes wear out?
Using the latest research we seek to answer this question from and injury perspective, a performance perspective, and a comfort perspective.

[@RunningXpert]

When do you usually replace your running shoes?
- Kasper

[@Jan-ms9tl]

I go by a millage indicator (wearing shoes to a ablosute maximum of 850km if they last that long) in combination with an optical one, so e.g: how is the outsole looking (any exposed foam or other signs of wear and are there any unusual things that shouldn´t be there like any form of damage etc..) and for shure I also go by feeling (you notice if there is something wrong a shoe or not).
Really good video guys, keep it up!

[@RunningXpert]

This format takes quite a lot of work, so I'm really happy you like the video! ☺
Millage is a fine indicator, but yea ultimately it's you who decides when it's time to change. We don't believe there is a set distance that runners should switch at. Like you said, looking at the shoe and feeling it out, is the best indicator as to when it's time to change.
- Kasper

[@ruffeyx]

thankyou for this!
i always thought these "mileage indicators" is just some marketing thingy.
my asics novablast 1 at 1000km still feels really good running in them, even compared with my new pair of novablast 3. grip still ok, no exposed foam under the outsole too. i think as long as im comfortable running in them, not gonna retire them.

[@KenanTurkiye]

Many runners are more seasoned runners than me and would know better, but for those new runners out there, know that your shoes will perform differently depending on the weather/season of the year you're in,
so don't throw out your normally good pair especially in winter thinking you aren't getting the response, it just maybe due to the cold.

[@RunningXpert]

Hey Kenan,
Here's a fun one to add to your comment. Different materials also have different reactions to change in temperature. EVA, the most common foam for most daily trainers, is widely known to be harder during the winter and softer during the summer. While TPU is known to be soft at most temperatures without the big changes. The newer PEBA based foams also seem to be softer all year round. So keep in mind what foam your shoe has as well.
Hope you are having a nice day.
Lars

[@KenanTurkiye]

@@RunningXpert Hi Lars,
thank you for the knowledge filled response, I wasn't aware of those details, much appreciated.
Best wishes. 👍