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* If the landing forces are concentrated, this will dramatically increase shoe wear. So a runner than lands with a midfoot strike will tend to spread the landing forces, where a runner that lands on the edge of the heel will focus the forces in a small area.
* Good [[Running Form]] ensures that the shoe doesn't scrape as it lands. Without this 'paw back', the scraping will wear away the rubber or foam quickly. If the scraping is combined with a concentrated landing area, the effect is a rapid removal of material under the initial contact patch.
* For most shoes, the limiting factor in shoe life is the foam midsole cushioning rather than the harder rubber outsole. The means the foam becomes compressed and offers less cushioning. The reduced cushioning is generally not the problem, but rather it's the uneven reduction across the shoe that starts to cause biomechanical problems. A common situation is that the foam under the ball of the foot wears and so the foot is tilted inward. The foam insole often fails faster than the midsole, so consider [[Replacement Insoles]] to extend the shoe life.
* Thinner shoes tend to last longer than thicker shoes, which is perhaps counterintuitive. This is because a shoe with a 40mm midsole that loses 20% of its thickness due to wear would be 8mm thinner, where a shoe with only 10mm would only lose 2mm.
* The life of the hard rubber outsole is rarely an issue, and by the time the outsole is worn through the foam is dead. However, there are shoes that use relatively soft outsole that can wear more quickly. If you're wearing through the outsole before the foam is dead, there's a good chance you're not pawing back correctly and your shoes are scraping as they land. This tends to waste energy and is a sign of poor [[Running Form]].