A gearset is actually a list of gears that help a rider to maneuver from an entire stop to the going speed. The clutch is responsible for engaging and disengaging the power from the engine crankshaft into the transmission. Sprocket or cog: wheel with teeth that meshes with the chain; https://bikeenginetypes83691.blogkoo.com/engine-bike-kit-no-further-a-mystery-54378540