The description of Segway x2 wheels according to Segway Inc. says that “The Segway x2 is deeply, all-terrain tires can master intimidating patches of dirt, gravel, grass or sand. A special adaptation of Segway Inc.’s dynamic stabilization technology and a wider track maximize stability, while the Segway x2’s higher ground clearance ensures that steep hills, uneven trails, and errant rocks won’t impede your ride.
It can carry you up to 12 miles/19km on a single charger, and when you want to transport your Segway x2 to an off-pavement destination, oversized handles make it easy to hoist it in or out a vehicle. Wherever your pursuit of the adrenaline rush takes you, pure exhilaration is sure to follow as the Segway x2 propels you over the landscape, instantly responding to your every move.”
See more on Official Segway X2 Page.