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𝔒𝕨𝖑𝘡
Marathon Racer so far is a great alternative to the Brompton's own, and still feel nippy compare to the standard Brompton Marathon (they felt a little squirmy like they're low on pressure).
The newer Marathon Plus is slightly smaller and fit better on Brompton now, so that's a good option to nearly reduce the risk of puncture to zero.
You don't wanna skip the weight on tyres, it's a Brompton, the kind of bike you (supposedly) ride with normal clothes.
As for inner tube, the most common are the Schwalbe No.4 16-18" one, as long it said between 28-349 to 37-349, you be fine, shop around and you might get some cheap.
As for puncture, 15mm spanner is your friend, but you might need a couple of small piler to undo the gear incidator (I tighten them up by using a pilers on all the Brompton I've built/service as they can get loose under vibration).