https://www.bike-components.de/blog/en/how-tos/oneup-shark-conversion-kit/
How to massively extend your gear range without switching the whole drivetrain.
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https://www.ebikessentials.com/
E-Bike Essentials is your e-bike conversion kit supplier. Shop for everything from front-hub and mid-drive e-bike kits to batteries and comprehensive sets.
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https://www.cyclingnews.com/features/types-of-e-bike-conversion-kit/
There are many different e-bike conversion kits on the market, but they all work in one of a few ways
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https://www.hootbikes.com/
Hoot85 - The Flat Land Snow Bike! A one time conversion with no need to swap the track! Snow to dirt in just a few minuets. - Available Online!
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https://www.tomsguide.com/home/electric-bikes/clip-e-bike-conversion-kit-review
The CLIP e-bike conversion kit is a clip-on clip-off device designed to power up your daily commute. Unfortunately, it has too many shortcomings to recommend.
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