In 1959 , Ariel broke with tradition and produced the Ariel Leader , a fully enclosed 250 cc two - stroke that aimed to combine the benefits of the motorcycle with the advantages of a scooter .
In 1959 , Ariel broke with tradition and produced the Ariel Leader , a fully enclosed 250 cc two - stroke with a fully faired body from the headlamp aft . 
 The Leader aimed to combine the benefits of the motorcycle with the advantages of a scooter .