Thought I'd post about this here, learned about this on ADVrider. There is a dirt bike that just came out in the produced by a company called Kollter that has a 4 speed transmission. It looks like basically a traditional motorcycle engine with a huge starter strapped to it to make it go. The specs are pretty good, outspecs the Sur Ron Light Bee.
They've got these two bikes currently looks like a Zero FX
The west coast one has something called a Sierra Ion also, looks like a hypermotard
Also this dealer in Costa Mesa is selling them, you see a bunch of Triumphs and HEY an electric bike
https://www.cycletrader.com/motorcycle-dealers/detail/Triumph Classic Motorcycles-3046346
Someone found a motor kit that's in the Banshee also, would love to build an electric quad with this =P
A store on the east coast is selling them Naticycle