Are Chainless Shaft Drive Bicycles a GENIUS or TERRIBLE Idea?

Summary

The main theme is the history and practicality of shaft drive drivetrains on bicycles, contrasting them with chains and belts. Key subjects discussed include efficiency losses, weight penalties, gear alignment challenges, proprietary parts, and a comparison to current technologies like internal gear hubs. The practical takeaway is that while shaft drives offer a maintenance-free and clean experience, their reduced efficiency, added weight, and complex engineering compared to modern derailleur and belt systems have prevented widespread adoption.