MTB Tours - Mountain bike tours in Argentina, Brazil, Uruguay and Chile. Explore the Patagonia, cross the Andes or bike the Brazilian beaches with vehicle support. Point to point or round trips with different ability levels. Peru Discovery - Specialized on MTB and hiking and offer tours with 6 to 8 people max. Into the Sacred Valley or from the Andean highlands down to the Amazon Rainforest. Gravity Assisted Mountain Biking - Provides descriptions of the different mountain biking possibilities around La Paz, Bolivia. Arie's Bike Company - Offers guided mountain-bike tours all over Ecuador. Biking Dutchman - Downhill mountain bike tours in Quito. Tours, reservations, photographs, and contacts. Nichols Expeditions - Bicycle tours from Lake Titicaca to the Sacred Valley of Machu Picchu and Hike the Inca Trail to Machu Picchu.