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that is ridic light .. lighter than 9000 shifters and brakes .. the ball is clearly in frame/bike designers court now.
Nice but pricey etc
http://www.starbike.com/en/shimano-dura-ace-di2-disc-brake-set-st-r9170-br-r9170-rear/
http://www.starbike.com/en/shimano-dura-ace-di2-disc-brake-set-st-r9170-br-r9170-front/
amey
attention @amey :)
Dura-ace R9170