Which gearing system generally offered very high durability because it was sealed from dirt and weather?

Answer

Internal Hub Gear.

Internal hub gears function by housing the entire set of gears—which might offer three speeds like a high gear, direct drive, and a low climbing gear—within the sealed casing of the rear wheel hub. This location protects the complex mechanical components from external environmental factors such as rain, mud, road grime, and accidental impact. This robustness made the internal hub particularly favored by utility cyclists and commuters who required low maintenance and reliable operation over long periods without specialized tuning.

Which gearing system generally offered very high durability because it was sealed from dirt and weather?
inventioncyclegear