I have found over my 32 years of riding and 7 MC's, that tires pressure is the cause 95% of the time. Tire pressure should be determined by load carried. Example: What do you do when hauling a load of dirt in a PU truck? You add more tire pressure to handle the load. If you don't, the rear tires will heat up, wear poorly, handle scary and possibly have a blow out. My testing has come up with the following cure for the GL1800. Tire Pressure: Run 41F & 42R for a 150 lb. solo rider (no gear in the bags/trunk). Add one psi to the front tire for every 100 lbs. of additional load. Add one psi to the rear tire for every 75 lbs. of additional load. Additional load equals: extra rider weight, passenger weight, and weight of gear in your bags/trunk. I tip the scales at about 240 and run 42F & 43R. I ride at 10-20 mph over posted speeds. I replaced my Bridgestones at 12.5k – my tread wear was smooth, even and rounded. With the misses on board (110 lb.), and 40 lbs. of gear in the bags/trunk – I run 43F & 45R. Give it a try. I think you will like the improved handling, even tire wear and extra tire mileage.