If you were doing a round the world trip starting in Europe and continuing East and were comfortable carrying an extra set, what 2 sets of tires would you take? Highways in Europe, mud in Africa, rocks on the Silk Trail, endless roads in Australia, what would you mount and what set would you carry? This assumes you could only get new tires shipped to you in large cities. Many of the roads you take are in VERY remote areas. So mileage and toughness are paramount. What do all y'all think?