Each running brand has a recommended milage for your shoe. An overall rule of thumb is to replace your running shoe every 300 to 400 miles. This can vary depending on your running style, body weight, and the surface you run on. If you run a lot and run on rough roads and trails you will need to replace your shoes sooner than if you mainly run on treadmills or only use your shoes for walking. If you are noticing any pain while running or after running, such as shin splints, jo