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@rive_gauche
read this > http://www.roadbikeaction.com/Most-Popular-Stories/content/67/6510/First-Ride-Shimano-Dura-Ace-Di2-9070.html < suggests 'some' compatibility, but among several incompatibilities a new crankset required..? $$$
also, great to see they got a picture of scoble leading the pack