Think of it this way. A plane only needs them to land or take off. They don’t need big wheels like a car to take every bump on the road (since they spend most of their time flying) so they don’t need the same proportion of tire size like a car would. And the wheels they’ve got are enough to do that job without a problem. (And like others have said, the don’t move the plane so they only need to keep it in place or roll when landing or taking off).
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