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coventry_eagle
I see SJS have the Contact Urban for Brompton at £19 which is not too bad.
A reliable tubeless setup would be really well suited to commute bike use. The time when you least want to get a flat, in the place where you least want to have to change a tube.
But aside from the practicalities (the Contact Urban isn’t tubeless ready anyway), I think a Brompton at 70psi would be hard work even with a tubeless tyre. They seem to need to be up around 100psi and I doubt if that would be much less tubeless. I’m not sure if sealant reliability is there yet at those sort of pressures.