The inventor of the revolutionary ZX Spectrum computer Sir Clive Sinclair is back with an electric bike called the Sinclair X-1, due out in July 2011. The X-1 includes a 24v lithium-polymer battery that drives a 190-Watt motor via a fixed-gear drive train. The whole vehicle weighs a heavy 30 kilos. The X-1 cost £595 (690 euros). Preorders are available via the company’s website.