Surly Nate 26 x 3.8" Tire 27 tpi, All Black Wire Bead. Surly Nate 26 x 3.8" Tire 27 tpi, All Black Wire Bead. Nate is a shred-your-face-off, run-over-anything, kung fu grip knobby tread pattern. And a great all around tire for your Pugsley ! Tall, widely spaced knobs are siped for added grip and compliance, which optimizes their grip. The knobs wide spacing means they dig deep and still shed the crap youre riding through. Note: This tire needs Super Fat 26" Wheels ! Designed to fit Surly's Pugsley frame and Large Marge rims. Will fit other manufacturer's appropriately wide rims ! ISO Diameter: 559. ISO Width: 94 mm. 27 TPI. 5-30 PSI.