What the wear on your running shoes means.
Flip your shoes over. The rubber goes first wherever your foot loads the ground hardest, so the pattern is a record of a few thousand strides. Here are the seven patterns you will actually see, what each says about your landing and roll, and the honest limits of reading a sole. Or skip the reading and let Sole Reader map yours from a photo.
Outer heel wear
The most common pattern on earth, and usually nothing to fix.
Read the patternInner edge wear
Wear on the inside of the heel and forefoot points to the foot rolling inward.
Read the patternOuter edge wear
Wear all the way down the outside of the sole suggests the foot stays rolled outward.
Read the patternForefoot wear with a clean heel
Wear under the ball of the foot and toes with a crisp heel means you land on the forefoot.
Read the patternEven midfoot wear
Wear spread from heel through the middle of the shoe means a flat, midfoot landing.
Read the patternToe drag and scuffed toe caps
Scuffing at the very front of the sole means the foot is not clearing the ground on the swing.
Read the patternEven wear
Wear spread evenly across the sole is what a well-matched shoe and a balanced stride look like.
Read the pattern
A note on pronation and wear
Shoe stores have read outsoles for decades, and the broad strokes hold: where you land shows up clearly, and a shoe that wears down one whole edge is telling you something. But studies that measure the foot directly find only a loose relationship between how much a foot rolls inward and how the shoe wears, and many healthy, fast runners pronate more than the textbooks suggest.
So treat pronation calls from a sole as a tendency worth noticing, not a diagnosis. The pattern earns a shoe change when it travels with a symptom: inner-edge wear plus shin or arch pain, outer-edge wear plus ankle rolls or outer-knee pain. On its own, an unusual pattern in a pain-free runner is just an interesting fact about you.