From the Super Mario Wiki, the Mario encyclopedia
The Mushroom tires are a set of unlockable wheels in Mario Kart 7. As their name suggests, they are wheels that are shaped and colored like mushrooms. Their best strengths are their speed and handling, while their acceleration, weight, and off-road are hindered. These are one of two tires in Mario Kart 7 that do not return in Mario Kart 8, the other being the Red Monster tires.
They return in Mario Kart Tour equipped by the Cheermellow, with a different shape. Pink versions of these tires are used by the Pink Mushmellow, and orange versions are used by the Birthday Girl Daisy.
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