Water on an icy surface is wiped by the rubber edges of sipes of studless tires. However, it is said that the water on the icy surface forms a thin film rather than being removed completely. Relatively few studies have been reported on the contact condition of the rubber edges and the formation of a film of water due to wiping. In this study, the frictional properties and the contact areas of model sipes of studless tire were measured. In addition, the thickness of water film formed on the surface was also estimated by the optical interferometry method. Three types of styrene butadiene rubber with different levels of hardness were used as rubber specimens. The experiment was conducted by varying both the number of rubber edges and the slope angle between a glass disk and the rubber specimens. As a result, it was found that the contact area between the glass disk and the rubber edges with a slope angle of 0° tended to increase as the sliding speed increased. In the case of a slope angle of 0°, the coefficient of friction of single and double edges tended to decrease; however, the coefficient of friction of triple edges showed an upward trend. The thickness of the water film formed after the surface was wiped ranged from 0.98 to 1.46 µm, which increased as the slope angle became enlarged.