- six circumferential grooves to actually cool the tire, improve responsiveness, and jettison water from the tread. the Solid center line Enhances stability while high-density sipes give the tire hundreds of minute grooves for better traction and overall performance. the Open shoulder Design lets water escape from the grooves, while stepped groove Walls Provide Additional Edges for better grip. - nylon belt overlay to strengthen the tread and reduce belt movement. Extra-wide high tensile Steel belts Provide precise handling and absorb shock. - the specially Formulated sidewall compound Resists aging, cracking and abrasion, while the rim protection bar shields against scuffing and obscuring the rim flange.