State of the Art sport touring design. Storm 2 Ultra is an evolution of the award winning Storm-ST range giving you more mileage and grip. Multi-compound Super Rich Silica (SRS) treads give rear tires an extra 12% mileage. New technology is incorporated in the 0 degree belting system and tuned dynamic stresses within the carcass. This new technology not only increases mechanical grip, giving improved traction in both the wet and dry, but also enhances handling and ride comfort.