The GoCycle GXi is a premium folding electric bike that offers a top speed of 20 mph (32 km/h). It features a sleek design, high-quality components, and a compact folding mechanism that allows for easy storage and transportation.
It's important to note that technology and products evolve rapidly, and there may be new models available since my last update. I recommend conducting further research or checking with bike manufacturers and retailers to get the most up-to-date information on the fastest electric bikes that can be folded.