An electronic gear-shifting system is a method of changing gears on a bicycle, which enables riders to shift with electronic switches instead of using conventional control levers and mechanical cables. The switches are connected by wire or wirelessly to a battery pack and to a small electric motor that drives the derailleur, switching the chain from cog to cog. An electronic system can switch gears faster and, because the system does not use Bowden cables and can calibrate itself, it may require less maintenance.[1]
- ^ Best, Paul (2009-04-08). "Shimano's Dura-Ace Di2 electronic shifting to give road racers a time advantage". Gizmag. Retrieved 2010-02-10.