The more you ask these questions, the worse the advice you attract. Think about that.
What was true in 2006 has nothing to do with life in Argentina these days. You probably already know that, but it appears #5 does not.
What makes sense in an alternate universe in which Brazilian tires are cheaper when purchased in Brazil has no relation to the way it works here in the universe we inhabit. Don't listen to people who tell you it'll be cheaper in Brazil.
Bring your tire if you're willing to schlep it around. Bring your battery too, if the airline will allow. Bring whatever else you want to save money on--anything you're willing to carry (and risk having confiscated, although the risk is minor--this is known as "smuggling"). Otherwise, just buy it in Paraguay. You can cross the bridge with or without a visa, as you appear to know. Asking for answers you've already got just increases the odds you'll get another incorrect one. Then what?
Mark
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