Big mean Nate.
The Surly Nate Fat Bike Tire is large, aggressive, and only afraid of not moving. The knobs are tall and spacious, so they clear all manner of trail muck and bully the trail into submission. The knobs also continue onto the shoulders, so traction doesn't suffer when you're riding off-camber and through harrier sections of your favorite trails. The durable 120 TPI and Kevlar bead mean you'll be able to enjoy Nate's aggressive debris clearance for a long, long time.
The Surly Nate Fat Bike Tire comes in the size 26 x 3.8" and fits rims from 50 - 100 millimeters.