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Conventional metallic bicycle wheels have 24, 28, 32 or 36 spokes. Wheels on tandems and BMX often have 40 or 48 spokes to support additional stresses and weight. Lowrider bicycles may have as many as 144 spokes per wheel. [20] [21] [22] Wheels with fewer spokes have an aerodynamic advantage, as the drag is reduced. The reduced number of spokes ...
The propulsion is provided at the pedals rather than at the wheel, being eventually applied to the wheel via the bicycle's standard drive train. Freewheel crank , that is a freewheel in the bottom bracket, is a necessary part in mid-drive systems to allow the electric motor to work inside its optimal rotational speed range ( r/min ).