They seem to be so small and unstable, thinking about the weight of the airplane, especially filled with passangers and luggage. How do they carry the weight, as well as being able to accelerate and break and everything?
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One important thing about airplane wheels: they do not move the plane. Their only job is to allow the plane to roll, which removes much of the delicate parts that a car wheel (as an example) would have. They are more like the casters on a cabinet or table in that regard instead of the wheels of a land vehicle.
Instead, a plane is moved either by their engine (the same thing that lets them move forward in air, just lower powered until they are taking off) or an extra car that pushes/pulls them along.
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