Use one bottle? That will drop over one pound. Pedals? I can’t think of anything else. Wheels and tires are probably the heaviest parts but it looks reasonable there. Beyond those, you are likely to spend a lot to drop a few grams here and there. I’ve never understood the fascination with weight. As an aside, 46 cm sounds like a wide bar for a 53 cm bike. Do you do a lot of climbing?
Deda measures their bars outside-to-outside, so it’s actually a 44 or so ctc - fairly normal. But, I do like my bars on the wide side.
Loosing a bottle doesn’t sound like a very practical solution. You might be right that I’ve really hit the point of diminishing returns and I should just be happy with what I have.
I haven’t weighed her, but I’d bet she’s 17ish pounds right now.
Wheels and tires. You could get some Easton Ascent IIs or Bontrager Race X-Lites (for about $700 a set) and save some noticeable weight. If by saving weight your idea is to go faster you could ditch the very high rolling resistance GP4000s and go to Michelin Pro 2 Race tires. (I used to use the GP4000s and went to the Pro 2s with a noticeable decrease in the rr and actually an improvement in flat resistance. You also save 10-15 grams each.)
Wheels and tires. You could get some Easton Ascent IIs or Bontrager Race X-Lites (for about $700 a set) and save some noticeable weight. If by saving weight your idea is to go faster you could ditch the very high rolling resistance GP4000s and go to Michelin Pro 2 Race tires. (I used to use the GP4000s and went to the Pro 2s with a noticeable decrease in the rr and actually an improvement in flat resistance. You also save 10-15 grams each.)
Wheels:
Easton: 1430g
Bontrager: 1500g
Campy: 1520g
Somehow spending $700 to save 90g on the Eastons doesn’t seem like a good idea. That’s $7.78 per gram!
Tires:
The Michelin tires are nice and I use them for racing, but they seem to cut more than the Contis, so I steer clear of them for training.
The claimed weight for the Nucleons in heir tubular version is 1520 grams. However, the tubulars come in around 1550 grams in real life.
You have the clinchers. I have no idea of their claimed weight but in searcing I saw real world weights around 1600 grams, which seems in line to how many spokes they have.
However, I agree that Eastons aren’t a great savings. I would look into handbuilts for under $750 you should be able to drop a pound.
Besides that, there are a lot more lightweight brakes set to hit the market like a beefy single pivot from Bontrager, KCNC, and a couple others. That could probably be a viable option.
Besides that you are stuck with probably new Bars, seatpost and maybe a cassette(though this will cost money).
For a seatpost, if you could get by without setback, which it looks like you’d be borderline, I would recommend a KCNC. Cheap and light for sure.