What bike are you riding? Some sizes are more common than others.
My advice would be to pack a spare rear tire on the back. Front tires last at least twice as long as a rear, so, if you begin the trip with a NEW front and rear tire, and pack a spare rear, you are good for quite a good distance ... but of course this depends on:
1. The bike??
2 On Road or Off Road ??
3. Riding style (hard or easy? fast or slow?)??
MotoAdventure is a BMW$$$ RENTAL PLACE$$$. Friends rented from them, expensive but good bikes. Not sure on tires or what they stock. Probably just tires for their rental fleet.
Ushuaia has a couple moto shops now (none recommended), doubt they stock much in the way of tires??
Not sure about Punta Arenas, but probably a shop there without tires. Any tire you buy down there is going to cost you BIG. Best to buy tires in Santiago. Don't forget about spare tubes and good patching/repair kits ... that you actually know how to use.
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