The Smart Wheel weighs 3 kg (6 lb), and its hub contains a lithium battery pack, a 250-watt motor, a Bluetooth module, and sensors for monitoring factors such as acceleration, torque and temperature.

I know it's important to mix up your workouts to keep your body guessing, prevent injury, and not get burned out on one thing (blah, blah). But if I had one fitness class that I had to pick for the ...

The GeoOrbital electric bike wheel on a recent stop at Seattle Center. (Photo by Skip Ferdeber.) Think of the fabled “Tron” light racers from the movies and games of the same name and you’ll have an ...