Tube type (TT). Knob distribution and geometry designed to offer outstanding grip and traction with high resistance both in dry and wet conditions, from soft/loose terrains to hard. High Resistance Polyester carcass-material with X-ply construction for superior structural characteristics and excellent puncture resistance. OEM fitment on 450/525 EXC models. The 6 Days Extreme has won 26 World Enduro Championships since its debut. The ultimate off-road tire developed with World Champion factory enduro riders for the most extreme conditions. DOT approved.