Hey Mande,
I would hazard a guess that the quality of the Chinese bikes is not quite up to scratch for a long distance journey. Keep in mind that German/Japanese/British/etc. bike manufacturers that have been at it for decades and make some tough as hell bikes and even these are beaten up while enduring the rigors of overland travel.
An inexpensive Chinese bike is compelling but would require a heck of a lot of fixing along the way, even with light loads. A rip around a single country would be an interesting trip though and probably place realistic expectations on a bike with that build quality. They are getting better though every year so at some point, it will become a more realistic option. Safe travels.
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