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Carbon rims are no lighter...
Best thing you can do wheel wise IMO is just go 2spd rear and build a front with a superlight hub / wheel build - https://www.sjscycles.co.uk/wheelswheels-front/sjsc-for-brompton-front-wheel-black/
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Definitely full rebuild, and yes agree with the standard brompton rim, or sjscycles have cr18s made specially ...
https://www.sjscycles.co.uk/rims-tape/sun-cr18-16-x-1-38-349-abt-alloy-rim-black-28-hole/
has edscoble says, fronts are better to replace, unless dynamo, or even better, get a super light version ...
https://www.sjscycles.co.uk/wheelswheels-front/sjsc-for-brompton-super-light-front-wheel-black/(146mm spokes with angle drilled rim)
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not seen one to date, only the plates ( in alu) to use carbon rails, or the bolt in ti - https://www.sjscycles.co.uk/saddles/ti-parts-workshop-saddle-clamp-titanium-bolt/
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Ti folding/removable pedals here - https://www.sjscycles.co.uk/ti-parts-workshop/
Also look at the Jtek Ti seatpost
Jtek ti post - https://www.sjscycles.co.uk/seat-posts/520mm-jtek-titanium-seat-post-for-brompton/