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most of my weight savings have been offset partially, by dynamo front wheel and the sugino 75 crankset I put on. But as I mentioned I'm not looking to make it as light as possible. Make it lighter, but keep it practical.
When it's not being upgraded, brompton is probably my most used bike, so being able to just use it in any weather, at any time of day is important to me. So it'll always have mudguards and dynamo front wheel/light, and flat removable pedals. Everything else re: lighter this/lighter that doesn't really interest me. Sure I'd like them, but I can't justify the cost outlay for something that's working pretty well currently. And also whenever it starts getting a bit too heavy to carry, I just unfold it and push it.
I'm willing to dig a bit - at least until it gets stupid. It's a bike I ride and carry a fair bit.
I've shaved weight on the usuals though - "superlight" front wheel, folding tyres, pedals, saddle, my custom crankset (MegaEvo 386 BB, Cannondale Si cranks and SRAM chainring). I've also added weight though with light fixtures, mudguard support etc.
Ti Seatpost is defo on my agenda, but I want it to be the exact same length as the standard. Most I've seen are longer.