The Nokian NBX DH 26" Downhill Tire features a CAP n' BASE Tread Compound (carbon Silica dual compound tread), soft and sticky 55 ShA CAP compound maximizes the grip, and 61 ShA BASE improves handling by preventing lug bending. Tires feature CAP n' BASE Tread Compound: a carbon Silica dual compound tread. Soft and sticky 55 ShA CAP compound maximizes the grip, and 61 ShA BASE improves handling by preventing lug bending Some widths may not fit all bikes Tire Use: Mountain Tire Type: Clincher Tire Diameter: 26" ISO Width: 57 mm ISO Diameter: 559 Tire Bead: Steel Color Tread/Side: Black/Black PSI: 29 - 65 PSI Weight: 1,000.0 g