Schwalbe's Jumbo Jim knows that bigger is better. This is especially true if you want to ride in deep snow or loose sand. In these conditions, only large volume combined with extremely low air pressure can help. Schwalbe's Jumbo Jim is an extremely light-bike Fat Tire. In the usual Fat-Bike 4-inch width, it weighs less than 1000 grams. And for those particularly tricky trails, it is available in extra-0wide 4.80 inches.