OK.
Here's another tought, also weather related, although I have not travelled beyond Argentina and Chile: follow the seasons.
The Northern Eastern part of the continent will be scorching and 200% humidity in summer, whilst the South will be windy and colder in Spring, so perhaps head North East first then lopp back down toward the South for later in the year....
Don't know if this will help you. There are many experienced SA travellers on here: I'm sure some of them will offer thoughts. Also consider the timing of any events/festivals/carnevals that you might want to see... New Year in Ushuaia seems a favourite, although we spent that day in BA.
Ahhh, the memories....!
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Adventure: it's an experience, not a style!
(so ride what you like, but ride it somewhere new!)
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