While developing my latest prototype Avial Commuter e-Bike [1] with 250 to 1000W rear hub-drive, whose frame design also allows for chain and belt use in the drivetrain, I have decided to investigate the capabilities of different gear systems for bicycles. Why? The first factor is that common rear-wheel drive multipurpose bicycles for city and country use usually include the installation of a standard kit, for example, the Shimano Alivio 8-speed chain transmission system. It’s inexpensive, reliable, easy-to-use as well…