Surly's Pug Ops takes the term "all terrain bicycle" to a new, fantastically fun level. The Pug Ops was created to go where normal mountain bikes flounder, and use even bigger tires and rims than the standard Pugsley. 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. The drivetrain is ready for anything, too, with Shimano LX/SLX derailleurs, SLX shifters, and a burly Surly Offset Double crankset. And to help you master the most adverse conditions, you get tough Salsa components as well as Avid BB7 mechanical-disc brakes.