the headquarters of BH Bikes in Vitoria, a city in Spain’s Basque region. Founded in 1909 as an arms manufacturer, the company switched to bikes after World War I and introduced its first electric model in 2008. Today there are more than 60, ranging in price from about $1,300 to $5,200. “Growth has been tremendous,” says Mikel Quintana, head of the e-bike division, who expects to sell 20,000 this year, up 20 percent from 2015.