Is 26" the most common wheel size globally?
http://surlybikes.com/bikes/long_haul_trucker_complete
"The ‘Trucker is available in a 26” wheel size across the size run, with an option for 700c in 56, 58, 60, and 62cm sizes. Some people prefer the larger diameter 700c, and that’s cool. 26" is a more popular size around the world, however, so you’ll more easily be able to find replacement tubes, tires, and rims should the need arise. Smaller wheels are also stronger than their 700c counterparts, so they’ll stand up better to rough roads and heavy loads."
somegeek