The Shimano Dura-Ace group features the highest quality road bike components from Shimano (followed by the Shimano Ultegra group).In addition there's the Dura-Ace Di2 group, an electric version of the Dura-Ace group.
The introduction of the Dura-Ace group in 1973 was Shimano's attempt to break into the market for professional cycling components.In the beginning the groups where clearly influenced by Campagnolo while in the later 1980s own innovations were introduced.
The Shimano Dura-Ace group consists of the lightest, most precise and ergonomic road bike parts offered by Shimano.The Dura-Ace 7900 series not only offers finest mechanical performance, it is also the base of the electric Dura-Ace Di2.
The Di2 group is a an advanced version of the Shimanos Dura-Ace components.The shifting action works electric, without the typical cables. The rear derailleur and the front derailleur are powered by a battery.
This makes the newest Dura-Ace generation an even more attractive choice compared to its direct competitor the Campagnolo Record group.