I currently have a MT-44 Pirelli 130/80 19 on the rear of my '89 KX and the center bars are getting pretty worn from my asphault riding occasionally. The outside tread is pretty decent, but the center is worn a good 40% from new. I bought the bike with this tire on it, so I don't know how other tires perform. I ride in FL, where it's mostly sandy, and I HATE riding in the sand, so the ultimate soft terrain sand/mud tire is what I need. Does anyone have an opinion on a different tire? The new Dunlop 773 (I think that's the number) looks pretty decent. Also, what size should I run? Finding a 130/80 19 is virutally impossible. Would the 120/90 19 work well? Also, how easy is it to install the new tire myself? Thanks for any suggestions/help.