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depends on how much you want to spend, and how quickly you want to lighten the load. Plenty on here have lightened their bromptons, myself included, but it gets to the point where the cost starts to outweigh the benefits.
think your biggest weight saving gains will be seat post, rear triangle, wheels, pedals.
I brought my 2spd on cycle 2 work scheme for about £1100, think actual cost to me was like £700, 7 odd years ago, and have spent approx another £700-£900 swapping out seatpost, rear triangle, handlebars, pedals, saddle, crankset, front wheel, and other little bits to get it to how I'd like. So it could be lighter, but I've got mudguards and a dynamo front wheel, because it's a use in any condition town bike..
Personally think you're best bet is to try and get a chpt3 or similar ti lightened brompton secondhand and modify as you'd like..edit for clarification.
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cornelius_blackfoot
frankohara
Hello Brompton people, I'm still waiting for the greenlight / right opportunity to get involved and bag a Brompton - motivation would be to get something and then upgrade it to be as light and as marvellous as possible... what's the current thinking on sweetspot of price and viability for achieving that? i.e., do I just bite the bullet and buy a P Line and be done with it, or go secondhand and work up from there?
Edit - to remove link to something that's actually not as good as I first thought - question still stands though!