changing your running shoes every 300-500 miles replace your shoes every 300- 500miles therunnersguide.com therunnersguide.com therunnersguide.com sources say TheRunnersGuide.com A pair is designed to last about 300-500 500 miles sources say replacing your running shoes every six months therunnersguide.com http://www.therunnersguide.com/howlongrunningshoeslast/ you're supposed to change them up every six months you're supposed to change them up every six months therunnersguide.com http://www.therunnersguide.com/howlongrunningshoeslast/ changing your running shoes every 300-500 miles therunnersguide.com 250-300 miles