Courtesy Shimano
Shimano’s Di2 internal gearing system integrates electronic controls and display with e-tube wiring and internal gear hubs to make shifting gears smooth, precise and, dare we say, pretty. Even the battery disappears behind an internal seat mount. The system is also amenable to eight- and 11-speed internal hubs, flat or traditional road drop handlebars and mechanical disc brake or road calipers. shimano.com
