Originally Posted by
rms13
Including what? 53/39 crank, 11-32 cassette, cables and housings? Every verified weight I have seen has been around 2500g for the complete groupset with 50/34 and 11-25. Where are your extra 500 g coming from?
STI levers + cables, two derailleurs, both brakes, bottom bracket, 52/36 crankset, chain, 11-28 cassette. No housing.
"Verified" weights by whom? A complete 105 is nowhere near 2500g. At least not including everything you need for the actual groupset to work...
edit. accuracy