Roadmaster electric bike with a 26" wheelbase. The rear wheel's battery is self-contained. The wheel has a power of 250 watts, and the Li-ion battery has a power of 33.6 watts. A phone app is used to keep track of the settings. All you have to do is pedal, and it will assist/boost you at the speed and power you specify. The bike's gearing is currently set to single. Quite hygienic, light in weight, and easy to use. Suspension forks and seat post make for the smoothest riding bike ever.
It's possible to sell only the 26" 21-speed bike or just the electric rear wheel. Any 26" bike can comfortably fit an electric rear wheel. It flies about 30 miles on a single charge.