TT100GP. The legend continues. The new TT100 GP Radial brings back one of the most iconic tires in Dunlop's history: the legendary K81. It was the first production tire to reach a speed of 100 MPH at the Isle of Man TT. Its iconic look has been enhanced with a new generation of radial technology. The tread compound is synonymous with versatility and optimal performance in all conditions, while silica particles improve grip and mileage potential. All of this makes the new Dunlop TT100 GP Radial the ideal tire choice for Neo Classic Roadsters.