Sinclair C5 computers like the hugely successful ZX81 and ZX Spectrum, an affordable electric vehicle could unleash pent-up demand for a market that did not previously exist. However, Sinclair performed no market research to ascertain whether there was actually a market for his electric vehicle; as the director of the Primary Contact advertising agency commented in January 1985, the project continued all the way to the prototype stage "purely on the convictions of Sir Clive". With Sinclair's new specifications in hand, Ogle worked on a three-wheeled design dubbed the C5, which bore similarities with the earlier three-wheeled Bond Bug – another Ogle
Sinclair Zike public. The price (mail order) was £499, comparable with a top of the range tourer or mountain bike at that time. The initial production target was 10,000 Zikes a month. In May 1993 press reports stated that Tudor Webasto had terminated production because of low sales and that Sinclair was seeking a new manufacturer. In the end only around 2,000 units were sold. Sinclair himself moved on to the development of the Sinclair ZETA (Zero Emission Transport Accessory)—a detachable powerpack intended to sit on the wheel of any bicycle to help power it along. Sinclair put the failure of the