A lot goes into a bicycle wheel. It has to be strong, but racers want it light, and then you throw in aerodynamic efficiency which is desirable but which adds weight.  Like life, the bicycle wheel is a series of tradeoffs and priorities.

Bicycle wheel details, Tune Hub
Bicycle wheel details, Tune Hub
Bicycle wheel details, Tune Hub
Bicycle wheel details, Tune Hub
Bicycle wheel details, Tune Hub
Bicycle wheel details, Tune Hub
Bicycle wheel details, Tune Hub
Bicycle wheel details, Tune Hub
Bicycle wheel details, Tune Hub
Bicycle wheel details, Zipp 202 rim
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