Serfas Vermin MTB Rear Tire, 26 X 1.9-Inch Our dual density Technology uses multiple rubber compounds used to improve feel and durability Harder rubber compounds give you improved rolling resistance and improved longevity, while softer compounds on the outer tire improve grip Will help to reduce your risk of flats through the use of thin weave nylon layers between the tire casing and tread layer Intergrated Flat Protection System Center Slick with low profile lugs for less rolling resistance Fast tire for hard pack dirt or paved conditons Wire bead ensures a secure fit Max PSI = 65