Well, the Dunlop K70 i put on the front 2800 miles ago is well worn in the center of the tread. Lots left to the sides but will have to replace it soon. I attribute the wear to the softness of the K70 rubber and the extra weight from the sidecar during braking. So, hunting for tire with "harder" rubber that would last longer. Recommendations from tire companies for 3.25x19 tires are: Michilin pilot active, Bridgestone s11 spitfire. Any experience with those or other recommendations? Thanks, al