I settled on the Metzeler ME33 Laser 3.25 X 19 for the front and the ME88 120-90 X 18 for the rear on the '75 750 F many years ago. I got 16,000 miles on the last front and 14,000 miles from the last rear tire, running tubes, of course. Mostly commuting miles in southwestern Idaho. The interesting thing is that I have gotten more miles out of each succeeding tire over the years. I ride them down to the wear bars. Traction is great, wet or dry, and steering is neutral. They don't start feeling weird as they wear. Pressures are 38 PSI for the front, and 40 PSI for the rear.