Friction drives like the Rubbee provide a lighter, simpler option for transforming a regular bicycle into an e-bike. Velogical's all-new Velospeeder makes the friction drive even lighter. The compact e-drive solution weighs under 4 lb and allows for seamless switching between e-assist and manual riding. The company claims it's the lightest and smallest bicycle e-drive (soon-to-be) available.
Read the full article: Velogical shrinks the rim drive to "world's lightest" e-bike drive