Sinclair Zike maximum speed of the bicycle operating under its own power was kept below 15 miles per hour to prevent it being classified as a motorcycle under UK law. The Sinclair Zike was developed by Sir Clive Sinclair following the commercial failure of the Sinclair C5 in 1985. Electric vehicles were one of his long-term research ambitions. The Zike was financed largely with his own money, and the manufacture was subcontracted to Tudor Webasto, a Birmingham-based company. The Zike was launched on 5 March 1992 at the Cyclex exhibition in Olympia, London, when a prototype was demonstrated to both press and
Sinclair Research form of the "Z1 Micro AM Radio". In 2003, the Sinclair "ZA20 Wheelchair Drive Unit" was introduced, designed and manufactured in conjunction with Hong Kong's Daka Designs, a partnership which also led to the SeaDoo Sea Scooter underwater propulsion unit. July 2006 saw the release of the A-bike, a folding bicycle invented by Sinclair, which was on sale for £200. It had been originally announced two years previously. In November 2010, Sinclair Research announced the X-1 two-wheel electric vehicle, which failed to reach production. The Wrist Calculator was released by Sinclair Instrument in 1977. The MK14 (Microcomputer Kit 14) was