Currie Tech's eFlow E3 Nitro
Credit: Currie Technologies

Currie Tech is one of the oldest companies in the e-bike business, kicking off operations all the way back in 1997. The company’s line of eFlow bikes is intriguing for one notable innovation: The battery powering the motor is actually the seat post. Since the extra weight of the battery sits directly under the rider, the bike handles well and feels balanced. The Nitro is the top-of-the-line eFlow machine, a sporty hybrid city bike for fast commuting that was fun on the road and handled well on a gravelly path too. The Nitro also utilizes a regenerative braking system, which sends juice back into the battery when the brakes are applied.