Silica compound provides a grippy, yet smooth rolling base while carbide studs add traction when conditions get icy Weight optimized 120tpi casing, Silica rubber, max tire pressure 20psi Tubeless ready bead/casing Studded 26x4.8 559 Fold Bk/Bsk 20 2150 120 No 240UPC/EAN/GTIN: 848712032540