The 150 is right on the edge. I have a 150/80 Metz on my Electra Glide Classic, and have near 5000 miles on it. No problems so far. I do however, ride solo most of the time. I really checked it out with my dealer before ordering the tire. If you look at the bike, the chances of the rear tire carrying 760 pounds on an 800 pound bike are pretty nil. Look at the load distrubition. Others have done it as well.