^^ it would be about 2 pound lighter if you swap out the battery grouppo for Sram Red...if you wanted to be a weight weenie about it w/o compromising structural parts
Ultegra 6870 Di2 is 2,680g
Dura Ace 9070 Di2 is 2,047g
Sram Red 22 is 1764
Sram Force 22 is 2088
Sram Rival is 2214
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Rule #10 // It never gets easier, you just go faster.