A seal assembly comprising: - a fixed element; - a rotating element intended to be rotatable relative to the fixed element around an axis of rotation; and - a seal member comprising a stiff annular reinforcement mounted securely on one element among the fixed element and the rotating element, and a seal secured to the reinforcement, where said seal is made of an elastic material and is in contact with a sliding surface of the other element among the fixed element and the rotating element, and - an annular ring comprising a cylindrical portion mounted secured to the other element among the fixed element and the rotating element, and a flange portion which extends radially relative to the axis of rotation from one end of said cylindrical portion, said sliding surface being formed on said annular ring; - the seal comprises a first lip which extends radially from the annular reinforcement out to the cylindrical portion in order to be in contact with the sliding surface belonging to said cylindrical portion, and a second lip which extends axially from the annular reinforcement to the flange portion in order to be in contact with a sliding surface belonging to said flange portion; - said annular ring and said first and second seal lips (15a, 15b) define an internal volume, the seal assembly being characterized in that - The sliding surface has an arithmetic mean roughness (Ra) greater than or equal to 0.15 μm and less than 0.5 μm; and - the sliding surface has a roughness ratio greater than or equal to one, where said roughness ratio is the ratio of a first parameter corresponding to a quantity of valleys of a profile over the sliding surface to a second parameter corresponding to a quantity of peaks of said profile over the sliding surface. - a fixed element; - a rotating element intended to be rotatable relative to the fixed element around an axis of rotation; and - a seal member comprising a stiff annular reinforcement mounted securely on one element among the fixed element and the rotating element, and a seal secured to the reinforcement, where said seal is made of an elastic material and is in contact with a sliding surface of the other element among the fixed element and the rotating element, and - an annular ring comprising a cylindrical portion mounted secured to the other element among the fixed element and the rotating element, and a flange portion which extends radially relative to the axis of rotation from one end of said cylindrical portion, said sliding surface being formed on said annular ring; - the seal comprises a first lip which extends radially from the annular reinforcement out to the cylindrical portion in order to be in contact with the sliding surface belonging to said cylindrical portion, and a second lip which extends axially from the annular reinforcement to the flange portion in order to be in contact with a sliding surface belonging to said flange portion; - said annular ring and said first and second seal lips (15a, 15b) define an internal volume, - The sliding surface has an arithmetic mean roughness (Ra) greater than or equal to 0.15 μm and less than 0.5 μm; and - the sliding surface has a roughness ratio greater than or equal to one, where said roughness ratio is the ratio of a first parameter corresponding to a quantity of valleys of a profile over the sliding surface to a second parameter corresponding to a quantity of peaks of said profile over the sliding surface.