When to replace your running shoes
After 300-500 miles (or 400-700km).
Expect your running shoes to support you for 300 to 500 miles (roughly 400 to 700 km). This, of course, depends on the quality of your shoes and intensity of your running schedule.
If you're clocking in 25 miles (40 km) a week, for example, you can expect to plan on giving them a well-deserved retirement every 3 to 5 months. Maybe even a small funeral? They have been through a lot with you.
Anyway, doing this will keep your feet happy and your runs smooth.