This is not "new" news to runners, yet I think we all need to read this information periodically. Our shoes do NOT last forever! (Sorry, everyone.) And there are things we need to remember.
A shoe's midsole only lasts so long. It degrades from use and the resultant useful life of a running shoe is 350 to 550 miles.
This means that if you are running 20 miles a week, you should consider changing by approximately weeks 20 to 25. The shoe may still serve a useful purpose - casual wear for walking.
Sole wear does not necessarily reflect the loss of shock absorption by a shoe. Even with a new-looking shoe, adequate shock absorption may be lacking. Use the 350 to 550 mile guideline instead of trying to guess how worn your shoe should look. Buy your shoes at the end of the day, when your feet are somewhat larger from the day's walking.
Make sure there is about a finger's width at the front of the shoe. This will help prevent runner's (black) toe. The shape and depth of the front of the shoe also have an effect on this problem.
If you have had no problems while running in a shoe, you should probably try to obtain another pair of the same make and model.
Don't even dream of running a marathon in a new pair of shoes. Your shoe should have at least 100 miles on it to be broken in well enough to run a marathon.
. Make sure you carefully lace your shoe before running. Too tight a shoe may make parts of the top of your foot sore or squeeze your metatarsals too tightly. Too loose a shoe may make your foot move excessively and be less stable, resulting in more than normal pronation. Dr Pribut says, it is better to have a doctor examine your feet and watch your gait. It will tell them more about how your shoes will wear, than examining your shoes will tell you about either your feet or your gait.
With that said, I'll describe some things you may learn from looking at shoe wear.
One of the things to look for is asymmetry in wear. This will reflect asymmetry of function. There may be a leg length difference, one foot
