Mario Kart Wii
April 10, 2008
One of the medium-sized bikes in the game is called "Mach Bike", being named after the main characher's bike from the game Mach Rider.
While the reference in the name is clear and officially confirmed by Nintendo, its appearance seems to be that of a regular racing bike, not directly referencing the original bike's appearance in the game, nor in its official artworks, most notably lacking its guns.
Copyrights for both series are held by Nintendo.