Wheel assembly with outer hub having polygonal shape

A vehicle comprising:

• a vehicle frame;
• and
• a wheel supported by the vehicle frame, the wheel being rotatable relative to the vehicle frame;
• the wheel having a rim;
• the wheel having an inner hub concentric with the rim;
• the wheel having an outer hub concentric with the rim and the inner hub, the outer hub being between the rim and the inner hub;
• the wheel having a first set of spokes between the inner hub and the outer hub, the spokes of the first set of spokes being elongated radially from the inner hub and having a sinusoidal shape;
• the wheel having a second set of spokes between the outer hub and the rim, the spokes of the second set of spokes being spaced from each other circumferentially about the outer hub and elongated from the outer hub to the rim and having a sinusoidal shape;
• the outer hub having a polygonal shape having sides and vertices;
• and
• at each vertex, a spoke of the first set of spokes being aligned circumferentially about the outer hub with a spoke of the second set of spokes.