Abstract: A skate guard has front and rear pieces with slots for receiving the front and rear portions of a skate runner. A center piece is rigidly connected to the front and rear pieces, and it is formed of a stretchable elastomeric material which biases the front and rear pieces toward each other. The center piece has a downwardly facing tread surface, and it is stiff enough to keep the front and rear pieces substantially longitudinally aligned with each other when the device is not on a skate runner. In a gap between the front and rear pieces, the center piece has a runner-protecting portion which (a) is no higher than the bottom walls of the runner-receiving slots, and (b) lies between two vertical longitudinal planes which include the sidewalls of the runner-receiving slots. Separately molded elastomeric tread pieces are attached to the front and rear pieces. Each tread piece has a horizontal tread portion and a bumper portion which extends around the end of its respective front or rear piece.