Just as California upset the auto industry with Tesla becoming the highest valued auto company in the world, it wants to do the same with motorcycles. Two California motorcycle companies hope to bring a quiet revolution to motorbikes, a form of transport nonriders associate with loud noise.

The Zero SR/S electric motorbike. Cost as tested by the Wall Street Journal: $22,000. (Picture courtesy of Zero.)

Aerospace engineer Neal Saki’s company, located in Scotts Valley in Northern Calif…

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