With the Roadtec Z6, a touring tire, Metzeler designers optimized the working temperature of various bands in the tire profile. They kept it cooler on the center, to reduce wear on long highway runs, and hotter on the shoulders, for increased grip and great cornering ability. To accurately differentiate the working temperatures, Metzeler modulated the tension of the steel cords in the belts. Higher tension was applied to the belts in the center zone to enhance rigidity and stability for lower working temperatures and less wear. Belts on the outer edges of the tread featured lower tension, which induced heat buildup for enhanced grip. The Roadtec Z6 was a technical success, and it gave the company a free hand in the optimization of the tread compound.