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The biggest difference provided by the Di2 system is just how much quicker and effortlessly smoother shifting on the front chainrings is, even under load.
The front derailleur also trims automatically; the cage moves in response to the position of the rear derailleur on the cassette to ensure no chain rub and a quiet unobtrusive ride, enabling you to concentrate on the road ahead.
The removal of traditional mechanical cables in favour of electrical wires not only eliminates poor shifting caused by contaminates, corrosion and stretching, but provides effortless gear shifts.
High tolerance cold forged aluminium and composite construction.
Braze-on fit as standard; if your bike does not have a braze-on mount seat tube adapters are available.