The Surly Moonlander is the ultimate in go-anywhere mountain-biking. Highlights include a pair of 5? monster tyres that can be run at super low pressures to deal with earth, sand and snow.Moonlander runs 4.8? tires on 100mm rims. Such a large footprint allows you to ride them at very low pressure, which enables unparalleled traction and float over all kinds of terrain,wet stuff, roots, rocks, pebbles, gravel, sand, and many types of snow. Moonlander, like its name implies, is meant to go beyond where normal bikes, even normal fat bikes, can go. It is designed from the ground up to ride where there are no roads, no trails and no people.