You're right brakes doesn't weight that much, but it's a small addition to the final weight (very C+ I know).
Actually, taking 105 for an example, 350g pair calipers 250g for levers 50g/metre for cable
650g = 1.4lbs
Then you could factor in expendable shit like tyres and tubes which might vary by 500g each end blah blah
Also the fact that people weighing shit don't use proper scales, don't mention what's on the bike at the time, etc.
All this and the difference still comes down to having a good shit in the morning.
@hippy started
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Actually, taking 105 for an example,
350g pair calipers
250g for levers
50g/metre for cable
650g = 1.4lbs
Then you could factor in expendable shit like tyres and tubes which might vary by 500g each end blah blah
Also the fact that people weighing shit don't use proper scales, don't mention what's on the bike at the time, etc.
All this and the difference still comes down to having a good shit in the morning.