Surly Nate Tires. The kung-fu grip of the fat tire world. Features: Tall, widely spaced knobs with siping for added grip More aggressive tread than the other Surly fat tire options Tread wraps around to the side of the tire a bit which allows for continued traction while turning Specs: Tire BeadFolding TPI120 Labeled Size26 x 3.8 Tire Diameter26" Fat ISO Width (mm)97mm Tire Intended UseFat Bike Weight (oz)47.6 Tire TypeTubeless Ready Clincher ColorBlack Weight1350 Defined ColorBlack PSI30 ISO Diameter559 / 26" mtn