Bicycle double crank applying the force vector principle

摘要

It is a double crank device that applies the principle of force vector to the bicycle crank to increase the driving force of the bicycle.;Drive cranks with pedals and driven cranks with chain gears are installed in parallel to increase the rotational power of the bicycle by more than 50%, making it easy to use by all-weather children, regardless of road conditions or terrain conditions. Bicycle crank device used.