The rule of thumb in replacing your running shoes is to find a new one when you have run at least 400-500 miles on your old ones.
However, if you are a frequent runner, buying a new pair of running shoes every two or three months can be very costly.
You can save on extra bucks if you would take care of your running shoes.
The more you care about your running shoes, the longer they will last.
Here are some ways to make your shoes last longer:
Use your running shoes only for running.