My 450 has completely demolished the stock rear 756 tire in a very short time. Unfortunately for the tire most of the riding has been in the southern california desert. I realize that I probably need a 739 or any other hard pack tire. Summer is here and now my riding will be mostly tracks with an occasional desert trip. I know that the 756 is a great tire for tracks, but since I do plan to take a few desert trips. Is there a tire that anyone can reccomend that may work for both types of riding? Something that will last?What about the front stock 739, any recommendations for the track? Please help!