Most torque converters have a stall speed around 2000 - 2500 RPM. Which also happens to be the RPM range that your vehicle normally runs at cruising speed. At a lower speed you would be simply running a viscous coupling between the engine and transmission.
Then, thereâs the obvious choice: A dynamo attached to one of the bike wheels. (These devices in general are called generators, but when attached to a bike, a generator is traditionally referred to as a dynamo.
The Copenhagen Wheel is a rear wheel replacement and turns a standard bike into a power-assisted electric bike (250 watts for the EU market; 350 watts in the USA). It pairs with a smartphone app, which readies the wheel for use and also acts as a digital âkeyâ.