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Its the wrong mindset
You end up touring on a heavy, inefficient machine that can't handle off road and takes niche parts to fix. I've personally trashed the fold mechanism on one by overloading it and going over bumps.
If you want to be able to take your bike on public transport, get good at quickly disassembling the front wheel and even the fork and bars, slinging it in a random widescreen TV box from a tech shop or a bike box from a bike shop or sandwiching it in cardboard, and putting it in the luggage hold of a bus. Apart from metro systems (ina city you should be able to cycle instead) most trains I've been on have allowed bikes.
If you're spending 8+hrs a day on your bike don't gimp your riding experience just for the odd occasion where you spontaneously catch a bus without time to disassemble your bike on your tour
