Current 49++ Kenda Tires K838. Directional grooves channel water to the outer tire edge. These tires are ideal for commuting, recreational riding, and more. These tires are modeled after those of a motorcycle and thus designed to provide you with more speed and less resistance. Kenda's k838 tires are designed for increased speed and reduced rolling resistance. Kenda Tires K838 - Kenda K838 Bicyclesi Slick mtb/hybrid road and trail tire; Directional grooves channel water to the outer tire edge.