WEEKLY FUEL SAVER - HALF PRICE SALE ON JD BUG Kids Bike gear. Ends Midday 21 May while stocks last. The Pedal Gear Box is an extension for JD Bug´s training bikes. By simply attaching the Gear Box to the underside of the saddle, the training bike is transformed into a fully functional pedal bike. With this addition, your little explorers can have their first cycling experiences before they venture out onto a traditional bike.