An experimental study of the non-exhaust emission characteristics of fire wear particulate matter (PM) was performed using a fire wear simulator. Building upon previous studies of PM emissions from non-exhaust sources, the total amount of fire wear particles (TWPs) was measured and their morphological and elemental characteristics were investigated. The peak size of TWPs generated at a constant speed of 80 km/h was around 2 mu m. Under harsh friction conditions, the mean diameter increased and the size distribution broadened. In addition, the number concentration of ultrafine particles increased significantly. Based on morphological study, we divided TWPs into five categories: sausage-like particles, micron-sized spherical particles, torn debris, ultrafine particles, and aggregates of ultrafine particles. The results of energy dispersive spectroscopy analysis showed that ultrafine particles from fire tread were composed of carbon, silica, and sulfur.