Big jobs require big equipment. Enter Specialized's Purgatory Control Tire. Its large-volume casing floats over rock gardens, roots and keeps you firmly in command. Monster traction in soft/loamy conditions comes in the form of squared, biting side knobs with wide, openly-spaced center knobs that also clean the muck as you roll on through. Plus, this tire is tubeless compatible so you won't have worry about pinch flats and you can run lower pressure for unreal traction.