An eccentric crank can be the solution to cycling for people who have a limitation in knee bending and/or hip movement (the leg can often still be, as much as or even completely, stretched). The eccentric crank, also known as the eccentric pedal arm, allows you to make a smaller knee movement/bend compared to the unaffected side. An eccentric crank is usually made especially for you. The size depends on the knee bend/hip movement that is possible. This crank can be mounted on the left or right side of the bicycle.