Electric motorcycles are taking a big step forward.

Brammo announced this morning that it is rolling out a new line of electric dirt bikes featuring six-speed transmissions, an unprecedented development that promises to boost performance and increase range. Until now, electric motorcycles have used direct drive, providing optimal acceleration or top speed but rarely both.

By introducing multiple gears, the Oregon company’s line of Engage and Encite motorcycles can offer wheelie-inducing acceleration and grin-inducing top speed. Company boss Craig Bramscher claims its top-tier motocrosser rivals ...