Using a Bluetooth-enabled smartphone, an electronic gearbox and a few sensors, engineers have built a bike that shifts gears itself without the need for a flywheel.
The setup, designed by Cambridge Consultants, places sensors on the main crank and wheel to send both pedaling speed and road speed to a smartphone app. The app calculates the appropriate gear, and sends it via Bluetooth to a Shimano electric shifter, such as the Di2.
Continue reading Smartphone App Gives Bikes Automatic Gearboxes
