Can Zero's new bikes create a buzz about electric power?

At first glance the Californian firm's 2015 range of bikes — officially unveiled at Intermot in Cologne, Germany — looks a lot like its current range. However, pull away the fairing and the changes are massive. 

Chief among them is a 10% boost in range across the model line, meaning that when rode responsibly, they can go up to 185 miles (297 km) before the batteries need charging.