Tire - K591 - Rear - 160/70B17 - 73V ly designed for racing but now incorporating refinements to meet the demands of street riders, K591 delivers optimum grip in wet or dry weather for confident cornering, K591 is the Harley-Davidson? sport tire, and the only Harley-Davidson sport tire that is made in the U.S.A., V-rated for speeds up to 149 mph