Sinclair Research worried that Clive Sinclair himself was using his own personal wealth to fund his inventions. By 1990 the company's entire staff had been reduced to just Sinclair himself, a salesman/administrator, and an R&D employee. By 1997 only Sinclair himself was working at his company. In 1992, the "Zike" electric bicycle was released, Sinclair's second attempt at changing people's means of transport. It had a maximum speed of , and was only available by mail order. Much like the C5, the "Zike" was a commercial failure, and sold only 2,000 units. In 1999 Sinclair released the world's smallest radio, in the
Clive Sinclair 1,000 a month, placing orders with suppliers for 10,000 of each component to be delivered. Sinclair wrote a book for Bernard's Publishing, "Practical transistor receivers Book 1", which appeared in January 1959. It was re-printed late that year and nine times subsequently. His practical stereo handbook was published in June 1959 and reprinted seven times over 14 years. The last book Sinclair wrote as an employee of Bernard's was "Modern Transistor Circuits for Beginners", published in May 1962. At Bernard Babani he produced 13 constructors' books. In 1961 Sinclair registered Sinclair Radionics Ltd. His original choice, "Sinclair Electronics", was taken;