> Internal hubs are slightly less efficient overall and this depends a lot on the internal design and which gears are in use. But even these are something like

> Internal hubs are slightly less efficient overall and this depends a lot on the internal design and which gears are in use. But even these are something like 94% - 97% efficient. This isn't true. Rolhoff hubs can approach that for some gears, but bikes with them start at $2K. Nothing else except derailleurs are even close: http://bikeshed.johnhoogstrate.nl/bicycle/drivetrain/shimano_alfine_inter_11/#efficiency http://bikeshed.johnhoogstrate.nl/bicycle/drivetrain/shimano... https://www.cyclingabout.com/speed-difference-testing-gearbox-systems/ https://www.cyclingabout.com/speed-difference-testing-gearbo... Also, current shafts and bands reduce speed another few percent.