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
Mary Craig Sinclair Mary Craig Sinclair Mary Craig Sinclair (1882–1961) was a writer and the wife of Upton Sinclair. She was born Mary Craig Kimbrough in Greenwood, Mississippi on February 12, 1882, the oldest child of Mary Hunter (Southworth) and Allan McCaskill Kimbrough, a judge. Beginning at age 13, Mary studied at the Mississippi State College for Women (starting with what were essentially high school classes) and graduated from the Gardner School for Young Ladies in New York City in 1900. Her father was a wealthy attorney with banking interests, and a member of one of the oldest elite Mississippi families. Kimbrough (called