Line Coral Silica tread compound The next-generation tread compound uses the coral-like, expanding molecular structure of the silica and rubber compound to strengthen the stiffness of the tread pattern. This results in a precise steering feel for the driver. Thanks to the new tread compound, the Nokian Line SUV provides excellent grip on both dry and wet roads. It has excellent wear resistance, and the tyre retains its state-of-the-art properties throughout its service life. The entirely new combination of molecular chains also reduces heat generation and lowers fuel consumption.