What typically causes uneven tire wear on the outer edges of tires?

Uneven tire wear on the outer edges of tires is commonly attributed to under-inflation. When tires are not inflated to the manufacturer's specified pressure, the sidewalls of the tire can flex more than intended, causing an increased contact patch on the outer edges. This extra flexing leads to the outer edges wearing down more quickly than the center of the tire. Proper tire inflation is essential for maintaining even contact with the road and ensuring even wear across the tread.

While over-inflation can lead to uneven wear as well, it tends to cause more wear in the center of the tire rather than the outer edges. Misalignment can also lead to uneven tire wear, but this typically presents as wear on one side or throughout the tread rather than distinctly on the outer edges. Similarly, excessive load can affect tire wear patterns but is not as specifically linked to edge wear as under-inflation.