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@gbj_tester
About 60-70g for an integrated headset.
KMC X9-SL chain should be about 230g for a track bike, and for track use you could get away with an alloy sprocket at 1/3 the weight of steel if you find yourself close to your target weight. Some little things that make a difference are seat clamp, basic ones are heavy and light ones need not be expensive, and headset adjuster/fork bung is a place where you can cheaply shave off 30g. For a weight weenie fixed, I'd probably go for a bolt on sprocket just because there are some light front disc hubs which can be hacked, whereas the only vaguely light track rear hub is the AC and it's a bit limiting being 24h only