Hankook Optimo H725 All-Season Tire - 225/45R17  90H Solid centerline rib Improves driving feel and stability 4 circumferential grooves quickly evacuates water from the footprint Converging lateral slots reduce noise and provide greater stability and ride comfort High density siping creates hundreds of biting edges to improve snow traction Featuring CCT (Carbon Compounding Technology) and FSO (Footprint Shape Optimization)