I rode the K60 rear tire for 2300 miles on the CDR then doubled back into Colorado for high pass riding. The tire worked fine on the highway up from New Mexico but really had trouble with the rocky gravel roads around Silverton. If you notice the 17 inch tire has a solid stripe down the middle of the tire that does not exist on the 18 inch rear that at KTM uses. This has a bearing on stability in rocky terrain. I switched back to TKC80's when I returned. The milage is not as great but the traction is better on a 17inch tire. I wish the K60 tread pattern matched the 18 inch.