The Eco-Ride’s automatic power-assist mode senses how much force you’re putting into the pedals and adds to it. That cuts the effort of an uphill climb by about half.

What the E-Zip Trailz does for you is provide about 50 percent more strength than you thought you had. When you pedal forward, the DC drive motor mounted on the rear hub kicks in automatically and gives you an extra boost for hills or level ground.