A skate structure with longitudinally aligned wheels includes an inverted U-shaped frame, in the flanges of which there engage the ends of pivot pins for the wheels. The upper surface of the frame is provided with straps for the removable fixing of an article of footwear. The rear portion of the skate structure has an arm connected by a hinge. The upper element of the arm is provided with an element for securing a user's leg. The arm is pivotal about the axis of the hinge, but is prevented from rotating axially with respect to a longitudinal axis of the frame. During articulation, the arm interacts with an element that includes two inclined surfaces and provides traction for tightening the straps.