In 2011, the Interact family was completed with the addition of the ultra-high-performance K3 Racetec, which goes back to three tension zones. But here, the center one is the low tension one, while the outer ones, which are rather wide, use very high tension belts. The less-tensioned center zone maximizes grip for straight-line stability under acceleration and at high speeds, and, most importantly, for extreme braking. The outer, higher-tensioned zones ensure great profile stability under extreme loads from hard acceleration at maximum lean angles. Here, the compound is a bona-fide race spec--no corners cut.