Biked from Bariloche to El Calafate, bought new bikes in Buenos Aires six weeks ago. They did fine, we had a great trip. One size medium and one large.
Mountainbikes with racks in the back and double paniers, we rode 1700km on them.
Arrived in El Calafate today and we would love to sell them here, we can bring them to Punta Arenas when needed.
I'll be happy to write about the details when somebody is interested in buying.