Bicycle crank stretcher

The utility model provides a bicycle crank stretcher, it contains a first connecting rod and a second connecting rod. First connecting rod includes a transmission arm and a first swing arm, is equipped with 1 the 1st limit structure on the one end of the first swing arm of one end pin joint of transmission arm and the transmission arm. The second connecting rod includes a force exerting arm and asecond swing arm, is equipped with 1 the 2nd limit structure on the one end of force exerting arm's one end pin joint second swing arm and the force exerting arm, the other end of the other end pin joint second swing arm of first swing arm, transmission arm and force exerting arm be parallel to each other the interval side by side, first swing arm is disposed with the second swing arm side by side, a limit structure movably connects the 2nd limit structure makes force exerting arm and transmission arm keep constant spacing and can force exerting arm 0. It guarantees to turn to smoothly to dodge the front wheel that de