https://patents.google.com/patent/DE102012206865A1/en
This patent was applied for the design of the drive kit and the electric components in an electric bike. This patent was first applied on April 25th, 2012 in Germany, filed again on February 25th, 2013 in a European Patent Office, and one last time on April 22, 2013 in China. The inventor of this design is Hubert Benzel.
https://patents.google.com/patent/US20030141126A1/en
This patent was applied for retrofit kits for bikes. The patent was applied for on September 27th, 2002 in the United States and abandoned 2 years later. The inventors are Marcus Hays, Mark Concha, Ron Holder, Greg Rhoads, and Bohimel Mrazek
E-bikes for rental
In most major cities, E-bikes and E-scooters are available to be rented.
Small scale projects made by Youtube channels
Small scale YouTubers have built converted electric bikes from alternators with explanations. However, many lack the knowledge, space, and tools to proceed with the conversion process.
Pros
Small scale projects use recycled parts.
Cheaper than a retail electric bike.
Cons
Small scale project batteries need to be trickle charged.
Rental option costs can stack in cost from daily use and aren’t always readily available.