A quick look at Dynamic Bicycles' shaft-drive chainless bikes.
Analysis Of Advantages And Disadvantages Of Chainless Bicycles - Analysis of advantages and disadvantages of chainless bicycles - News - Xi'an Yongwei Metalwork Co.,Ltd
It's Called the INgSoc: A Chainless e-Bike That Is More of a Space Art Piece - autoevolution
Chainless Bikes - MetaEfficient
Shaft-driven bicycle - Wikipedia
BFS2017: Brik Bikes' the chainless bicycles, no maintenance Dutch commuters - Bikerumor
Bike2 Starts Shipping Chainless Hybrid Drive E-Bike System
Are Chainless Shaft Drive Bicycles A Genius or Terrible Idea? - CYCLINGABOUT
Eye-catching NuBike goes with drive levers instead of a chain