In a friction drive motor, a small, solid wheel rotates against the side of the tire in order to drive it. The first motorcycles used the same concept, with a motor mounted above the front wheel. The problem is that the drive rubs at the side of the tire. It's inefficient, and it quickly wears the sidewall away. Tires need to be replaced every couple hundred miles. For this reason, you'll seldom see electric bikes with this type of drive anymore.
Designed for riding around town, this pedal-assist bike has four levels of electric assistance – Eco, Tour, Sport and Turbo – and a maximum assisted speed of 20 miles per hour. This is a well designed and engineered bike, with Shimano Nexus components and a Bosch Performance electric-assist mid-drive system. Front and rear lights are included, and you can even use the battery to charge your smartphone. The integrated ring-lock will help deter would-be thieves, but it’s always best to back this up with a dedicated bike lock.
For many bikes, battery range is more important that total power (because they're all pretty powerful). You want a bike that delivers a range long enough for your rides at the power levels you want. Most e-bikes will have three to five levels of assist kicking in anywhere from 25 percent of you pedal power to 200 percent boost. Consider how fast the battery takes to recharge, especially if you'll be using your bike for long commutes.