Surly Knard Tires.
The Surly Knard tires started the fat bike and 29+ style of riding. The block style thread allows the tires to be equipped for multiple terrains, but best suited for dry rock and packed dirt.
There are two castings available for this tire: 27 and 120 tpi.
Weight: 29+ 27 tpi = 1240g and 120 tpi = 980g
700c = 27tpi wire bead - 650g / 120tpi folding bead - 465
26x3.8 = 27tpi - 1635g / 120 tpi - 1255g
26x4.8 = 120 tpi -