WHAT DOES ENGINE BIKE EXHAUST MEAN?

Jockey wheel: one of two small sprockets in the rear derailleur that guides the chain onto the cassetteSafety levers: Secondary brake levers employed to use brakes to ensure that the bicycle to decelerate or quickly quitMajor highlights ️[VIBRATION DAMPING Structure] This 4 stroke bike engine package has the look of vibration damping, which provi