Panaracer GravelKing ZX Plus Tire - 700 x 50, Tubeless, Folding, Black/BrownThe GravelKing ZX Plus was designed for high speed performance on hard packed gravel, a slick center tread reduces rolling resistance, while the shoulder pattern is tuned to transition smoothly to provide consistent grip in cornering and descending. Each design element is developed to meet the demands of racing, but with added protection for those particularly tough rides where there may be a greater risk of punctures. Ideal for gravel, dirt, and