Fresh modern rib design with new decoupling groove optimized for steer tire position. New decoupling groove minimizes uneven shoulder wear and maximizes steering response. Wider shoulder rib improves wear and stability over HMS II design. New F.E.A. designed mold shape utalizing natural shape theory to maximize treadwear and casing durability. Optimized blading density to resist cracking and tearing. Groove geometry improved to resist erosion wear and maximize resistance to rib tearing.