Kumho Ecsta LE Sport Radial Tire - 215/45ZR17  91Z Asymmetric design provides superb water evacuation for optimal driving on both wet and dry road conditions Solid center rib provides continuous contact with the road, enhancing straightline stability and steering response. Variable tread block design reduces road noise for improved ride comfort and overall driving pleasure. Optimized footprint shape provides stable driving performance and even wear for life of tire.