Vittoria Terreno Mix G2 TNTTerrain is not an issue anymore Whether in Gravel or Cyclocross, one thing is for certain course conditions are constantly changing. When you roll up to the start line, be confident knowing that you have the performance advantage of the Terreno Mix all conditions tread, no matter the terrain. At the heart of the design is a fast rolling center ridge, which is designed to minimize rolling resistance, while still providing confident braking traction.