Most shoes will last for 400 to 500 miles. It s a good idea to rotate two pairs of the same or similar training shoes. This will allow wet shoes to dry before you need to wear them again and save you a few trips to the running store. Not all injuries are caused by shoes, and new shoes won t instantly cure an existing injury. A correct new shoe model may remove the cause of the injury, so that the body can heal itself.
New shoes can t compensate for overtraining.
You get what you pay for. What you don t pay for now, you will probably pay for later. By the same token, the most expensive shoe isn t always the best one for you. Most of the time, a few ounces really don t matter. Lightweight trainers and racing flats work best for people with efficient biomechanics.