Runstreet reports that most running shoes last between 300 to 500 miles, or 4 to 6 months for a 20-mile-per-week runner. Worn shoes can lead to injuries and poor performance. Recognizing the signs of wear is crucial for maintaining running health.

Several factors influence shoe lifespan, including terrain, weather, and usage. Running on concrete wears shoes faster than trails, and extreme heat can deteriorate shoes quickly. Using the right shoes for different activities extends their life. Proper rotation of shoes can also help. Read more gear coverage.

Four clear signs indicate it's time for new shoes: flat midsoles, unexplained joint aches, worn-out tread, and reduced cushioning. Addressing these signs promptly can prevent injuries and keep runners performing at their best. Related: New Balance Launches SuperComp Rebel v1 for Runners.

This original Runner World brief is based on reporting from Runstreet. Visit the source for its complete reporting, context and any later corrections.