A wheel structure for a motorcycle, comprising: - a rim rotatable about a first axis and supporting a tire; - a fender covering in part said tire on the opposite side of said first axis; - a stationary structure (11; 7, 6), which is stationary with respect to said first axis and is adapted to be fixed, in use, to a body of said motorcycle; and - connecting means for connecting said fender to said stationary structure (11; 7, 6); said connecting means being selectively settable: - either in a first configuration, at which a distance (d) between given points of said fender and said tire assumes a first value; - or in a second configuration, at which said distance (d) between said given points of said fender and said tire assumes a second value different from said first value; said stationary structure (11; 7, 6) comprising at least one suspension element adapted to be fixed to said body of said motorcycle; said connecting means comprising a first connecting assembly selectively connecting in an adjustable way said fender and said suspension element; characterized in that said stationary structure (11; 7, 6) comprises: - at least one tubular element; and - said at least one suspension element, which is fixed to said tubular element; said connecting means comprising a second connecting assembly selectively connecting in an adjustable way said fender and said tubular element; said second connecting assembly defining at least one first and one second connecting points on said fender; said first and second connecting points being connected to said stationary structure (11; 7, 6) in said first and second configurations respectively; said first and second connecting points being aligned along a second axis transversal to said first axis; said second connecting assembly comprising: - at least one first screw directly or indirectly screwed to said tubular element; - at least one first slot carried by said fender and engaged with gap by said first screw; said first slot being elongated transversally to said first axis, so as to allow the movement of said fender with respect to said tubular element when said first screw is partially unscrewed and still engages said first slot. - a rim rotatable about a first axis and supporting a tire; - a fender covering in part said tire on the opposite side of said first axis; - a stationary structure (11; 7, 6), which is stationary with respect to said first axis and is adapted to be fixed, in use, to a body of said motorcycle; and - connecting means for connecting said fender to said stationary structure (11; 7, 6); - either in a first configuration, at which a distance (d) between given points of said fender and said tire assumes a first value; - or in a second configuration, at which said distance (d) between said given points of said fender and said tire assumes a second value different from said first value; said stationary structure (11; 7, 6) comprising at least one suspension element adapted to be fixed to said body of said motorcycle; said connecting means comprising a first connecting assembly selectively connecting in an adjustable way said fender and said suspension element; - at least one tubular element; and - said at least one suspension element, which is fixed to said tubular element; said connecting means comprising a second connecting assembly selectively connecting in an adjustable way said fender and said tubular element; said second connecting assembly defining at least one first and one second connecting points on said fender; said first and second connecting points being connected to said stationary structure (11; 7, 6) in said first and second configurations respectively; said first and second connecting points being aligned along a second axis transversal to said first axis; - at least one first screw directly or indirectly screwed to said tubular element; - at least one first slot carried by said fender and engaged with gap by said first screw; said first slot being elongated transversally to said first axis, so as to allow the movement of said fender with respect to said tubular element when said first screw is partially unscrewed and still engages said first slot.