The chromoly frame was built around humongous 4.8-inch wide tires on Surly Clown Shoe rims. These beautifully large assets are meant to roll over any obstacle. The flotation and traction gained by using large-volume, low-pressure tires can get you over and through otherwise unrideable terrain: ice, snow, sand, mud, wet rocks and roots. Speaking of ice and snow, the drivetrain uses Shimano SLX shifters so you can change gears in mittens, and a Surly Offset Double crank provides low gearing options. Plus, rain or shine, dry or mud bog, Avid's BB7 mechanical-disc brakes slow you down in any conditions.