Schwalbe Jumbo Jim Tire - 26 x 4, Tubeless, Folding, Black, Evolution, Super Ground, Addix SpeedGripBigger is better. This is especially true if you want to ride in deep snow or loose sand. The Jumbo Jim is designed to to thrive in these conditions with it's large volume casing combined with extremely low air pressures. Schwalbe Jumbo Jim Tire 26 x 4, Tubeless, Folding, Black, Evolution, Super Ground, Addix SpeedGrip Labeled Size: 26 x 4 Color: Black ISO Width (mm): 100 ISO Diameter: 559 26" mtn Tire Intended Use: Fat Bike Defined Color: Black Tire