Compared to the 2011 Zero S, the 2014 Zero SR has between 200-400 percent more everything – riding this bike was an absolutely shocking progress report on the state of the art. The SR represents a liminal moment in motorcycling. We may look back in years to come and see this as the first time an electric motorcycle stood shoulder to shoulder with petrol powered bikes, and made them feel like yesterday's heroes.

When we last rode the Zero S about three years ago, we came away thinking "what a nice little commuter, shame about the battery range."

Things have changed, and in a big way. The graphs below tell the story.

В