Ive run a 19" 756 on my 500,it lasted around 3 months of riding around 100 miles a week.But when I reversed it on the rim it was all over,chunking and veary fast wear.Half of the riding was mud/loam other half was the worst rocks (sharp) you could ride in.I had a 739 up front and it lost its bite around the same time,then started loosing knobs badly,buy I was happy with it and would recomend it ,like I said the rocks where bad.Im in Redding Ca.,what part of Nor Cal did you move to?