At 13K miles on my Kumho, it is showing sings of wear - probably have about 1K miles left before I have to replace it. Thought I would get at least 15-18K. My mc tires were wearing out after 9K miles so I guess I should be happy. I do enjoy using my throttle so that may be the root cause. I have had not problems with this tire from a performance standpoint and will order another one. Local dealer charges $25 to mount a new tire if I bring in the wheel.