Image 2
2) This image contains the crankset moving around the bottom bracket with the frame and chain-wheels behind. This image portrays the process of power transmission from the pedals to the cranks and ultimately to the front gear set. The cranks are constantly moving at different speeds depending on the input from the rider. This photo captures the dynamic nature of the operation of this integral part of the bicycles power transmission system from the legs of the rider to the chain.