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The bicycle crank (also known as crankset or crank arm set) is a lever system that transmits the pedaling force from the cyclist to the bicycle chain.

The force is then transferred to the chainring. As a result, the chain is driven, creating propulsion at the rear wheel.

Pedals are attached to the outer ends of the cranks. On the (rider's perspective) right crank, between 1 and 3 chainrings can be mounted on the designated crank spider, depending on the type of gearing system.

In the past, bicycle cranks were almost exclusively made of steel, but today, aluminum is the most commonly used material. Cranks must primarily demonstrate solid values in terms of stiffness, as the forces experienced during pedaling are substantial.

The stiffness of the crank also significantly affects the efficiency of power transfer. The stiffer the material, the better the efficiency.

In the lightweight cycling sector, carbon cranks have become very common. Thanks to the remarkable properties of carbon fibers, bicycle cranks can be constructed in entirely new weight dimensions.

Carbon is lighter than aluminum, but the manufacturing process is complex and requires great care to ensure maximum safety while riding.

Additionally, carbon cranks (like all other carbon-made bicycle parts) are highly susceptible to mechanical damage (scratches, cracks, breaks).

Price-wise, carbon cranks are significantly above average, but they also set new standards in terms of weight.