Care tires are flat and wide. Motorcycles maintain their balance and steer by making slight adjustments to the angle that the bike is at, so putting a car tire on a motorcycle would cause you to have a harder time rocking the bike back and forth and would also cause a sudden change of center of gravity when doing so because when leaning to one side suddenly the only point of contact with the road would be off-center from the bike on the edge of the car tire.
It would be unstable and unsafe to do so.
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