Hub Gears: does near-perfect efficiency really matter?
Do small gains or losses in efficiency really matter to commuters, multi-modal commuters, and leisure riders?
"If racers, or even commuting or touring cyclists, could choose optimum gears -- The mechanical efficiency of bicycle derailleur and hub-gear transmissions
they would be hundreds of meters ahead at the end of 60 km (37 mi)."
Chester Kyle and Frank Berto, in HUMAN POWER: the technical journal of the International Human Powered Vehicle Association NUMBER 52 SUMMER 2001