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I can build you an 8/9kg bike and it will be light enough and ride well, last and be suitable as a commuter.
I have this (ish, about 9.5kg) built by Ryan and its ace and still fully functional as any brompton.
Jtek ti is the lightest option that’s functional.
Also have this, its excellent, china ti posts dont have the lip at the bottom and the ones that need pentaclip can >>>>
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If the bike is not functional, what’s the point?
looks nice in @HoKe 's pics
Ti frames aren’t great;
Poor ride feel because clone not redesign, you cannot change the material and expect the same ride quality; think soggy noodle.
Hinge pins are trash, I wouldn’t ride it.
Finishing is not amazing.
Carbon post;
Just going to wear going up and down, not light.
Jtek ti is the lightest option that’s functional.
Chinese cheap light parts look good, but brands like Ace are cheap crap. The easy wheels for example, they are just low cost knock offs and a waste of cash.
If the bike is not functional, what’s the point?
I can build you a 4kg bike, but it will ride like crap and probably not last a few months... I can build you an 8/9kg bike and it will
Be light enough and ride well, last and be suitable as a commuter.