The Surly Knard Tire just makes sense. With its tightly-spaced, low-block tread pattern, it provides the perfect ratio of traction and low rolling resistance. It grips well on all sorts of different surfaces and will haul some sausage on hardpack terrain or groomed trails. If you want a tire that has a little less bite and a bit more speed but don't want to sacrifice traction, look no further. Specifications: Tire Type: Tubeless (Clincher) Bead: Folding Compound | Casing: - TPI (Threads Per Inch): 33 or 60 TPI Puncture Protection: Sidewall Inflation: 35 PSI Max Color: Black Weight: 1185g