Dunlop Sportmax GP-A Tires

With the introduction of the Sportmax GP, Dunlop has accomplished a feat totally unprecedented: produce a multi-compound tire that matches the rock-solid stability and predictability of the legendary D208 GP-A, while also enhancing the cornering grip necessary to exploit the full potential of today’s Supersport racing motorcycles. The Sportmax GP multi-compound rear tire design is so distinctive that Dunlop has received an international patent for their effort. The first layer is a continuous tread that spans the face of the tire from edge to edge. A second compound is then layered radially on top of the first compound to form the main running surface around the circumference of the tire. The first layer, called the lateral-grip compound, makes contact with the pavement whenever the motorcycle is leaned over, and therefore incorporates a rubber compound developed specifically to enhance cornering traction. The second layer, which contacts the pavement when the motorcycle is upright, uses a tougher, cooler-running compound that maintains straight-line stability and traction when the motorcycle is accelerating or braking in a more or less upright orientation; it is called the traction compound. The genius of the Sportmax GP’€™s multi-compound design is the Intertread Fabric (ITF), a gossamer-thin rubberized nylon ply seated between the first and second layers. The ITF is an engineered system that, when bonded with the two tread compounds, allows Dunlop’s engineers to fine-tune end-result characteristics to achieve an ideal blend of stability and wear as the tire transitions between upright and cornering attitudes.

The second significant feature of the Sportmax GP is its new tread pattern. An extension of Dunlop’s FEA (Finite Element Analysis) cosecant-curve design first introduced on the D207 and perfected on the D208 GP, the tread grooves continuously coincide with the forces running through the tire. As the curving tread pattern travels across the tire to the shoulder area, it keeps the driving and braking forces aligned properly as cornering forces come into play. The newer tread pattern of the Sportmax GP has more longitudinal elements in the center of the tread for enhanced wet-surface grip, yet sacrifices none of the D208’s excellent dry-surface wear performance. It is visually distinguishable from the D208 GP tread pattern by the V-shaped chevrons that are molded into the tread grooves in the middle portion of the tread. The Sportmax GP front tire is a single-compound design that features the same new tread design as the Sportmax GP rear tire.

Proof of the Sportmax GP’€™s performance was demonstrated at the AMA tire testing session at DIS in January 2005. Sportmax GP-equipped Supersport competitors chopped nearly a full second off of their laps times compared to D208 GP tires. More than just a Daytona special, the Sportmax GP stands ready to rewrite the lap records at race tracks across America.

Note: When new tires are fitted, they should not be subjected to sudden acceleration, hard cornering, maximum power or braking for at least 100 miles. Failure to do so may result in loss of control and serious injury. The 100 mile run-in is required to adjust to the feel of new tires versus the worn tires.