There’s an old saying that evokes a warm and cozy feeling that something delightful is “as comfortable as an old pair of shoes.”
Nice image, but for runners an old pair of shoes is simply anathema. Running in worn-out shoes can cause a host of injuries over time such as shin splints, strained muscles, plantar fasciitis, hamstring strains, knee pain (runner’s knee), tight calves, Achilles tendonitis, possibly even stress fractures.
None of these ailments would be as comfortable as an old pair of shoes. But take heart – a new pair of shoes can help prevent and injuries, so the trick is to know when to replace your running shoes.
Checking with any number of sources in the running community, there seems to be some consensus that the viable life of a running shoe is something between 300 and 500 miles. Mileage is variable depending on what types of surfaces you run on, how hard you are on your feet in a stride, and your particular style. The real measurement of when to replace your running shoes has more to do with the feel of each individual.
Most experienced runners will tell you not to look at the tread on the shoe, and the wear on the tread, as a guide. The outsole will wear out much quicker on some running surfaces and terrains, and a worn out outsole doesn’t necessarily mean the shoe is inadequate.
A more telling sign of diminishing running shoe life is in the mid-sole where most of the cushioning and stability comes from; this section generally will break down sooner that the bottom of the shoe since it takes the pounding of your weight.
Many runners keep a training log, so it is a good idea to make a note of when a pair of shoes is purchased and pressed into service, and over time you’ll have a better understanding of how long they last. After a few pairs it’ll be easy to replace them before they begin to feel “flat”. Keep track of your shoes in a runner’s log, write the purchase date in the tongue of the shoe, anything that will help measure longevity.

















