Origin8 Tsunami 20x4.0 Wire Black TireThe Origin8 Tsunami Wire Black Tire provides many different features for an ideal riding experience. The spaced-out lugs allow for minimal rolling resistance, even while rolling on a lower air pressure. The large siping of the lugs provides a high amount of grip on any surface. With 30 TPI, the tire is very durable yet forgiving. Size: 20x4.0. PSI: 20.888571022603