Thoughts on this?
FlyKly's smart wheel is designed to fit on just about any bicycle; it's lightweight (nine pounds), runs on a 36V Lithium battery, and its electric motor is so thin that it fits snugly around the spokes of the wheel.
Once fitted onto a bike, the smart wheel can help the user pedal up to 20 mph for 30 miles. If the user goes faster than 20 mph, like when racing down a hill, or pedals with the motor off -- the battery will charge automatically.
"The motor turns on when you start pedaling and begins accelerating to your desired speed. It stops when you stop," FlyKly writes on its Kickstarter page. "It saves you time by getting you to your destination faster and gets you there without losing your breath or breaking a sweat."
More at C|net.