Schwalbe Jumbo JimThe Schwalbe Jumbo Jim fat bike tires are offered in 2 different compounds. These top of the line performance tires offer exceptional grip over unforgiving terrain such as deep snow, sand, and mud. The large 26" x 4. 0" volume of the Schwalbe Jumbo Jim tires combined with its ability to handle pressures as low as 5psi ensure you can take your fat bike over any terrain with ease. Also, extremely light for a fat bike tire, weighing only 1090g, to ensure