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146mm (when paired with Brompton angle drilled doublewall rims).
Stick with Brompton's own rims, I think your Brompton doesn't have the double wall like the recent one.
To match the front, it's cheaper just to buy a new front wheel (unless you got dynamo)
https://brilliantbikes.co.uk/brompton-wheels/2396-brompton-front-wheel-black.html
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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)
Spoke lengths on a M6R? Popped two rear spokes in the last month, time for a rebuild... While I'm here, best value/quality black rim out there, may as well murder it out while I'm at it...