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I was doing a little trolling
Sorry but you're using internet terminology wrongly. The internet is serious business. Acceptable phrases are "I was doing some digging", "I was doing some trawling" etc.
For more information please read here
According to Shimano’s claimed weights, the R9150 Di2 group for rim brake is 2051 grams, 50 grams lighter than 9070. The R9100 mechanical group for rim brake is 2097 grams, four grams lighter than R9000
For disc brakes, Shimano is claiming a group weight of 2389 grams for the 9170 group, and 2445 grams for the 9120 mechanical shifting group.
http://www.bicycling.com/bikes-gear/road-bikes/first-look-shimano-dura-ace-r9100