one wheel a seat and handlebars a frame connecting the wheel and seat pedals a chain and sprocket a crank arm connecting the pedals to the frame a bell or horn for signaling
unicycle which has one wheel unicycle which is a seat and handlebars unicycle which is a frame connecting the wheel and seat unicycle which has pedals unicycle which is a chain and sprocket unicycle which is a crank arm connecting the pedals to the frame unicycle which is a bell or horn for signaling