Now that I'm making good power ( 10 mil) my tires [xc masters] just spin. I need a tire that can do it all. Not enough sand here for a paddle. I go down paved roads to get to riding areas. There is soft sand, gravel, hard packed and trails. Anyone use Skat trak terrain traks? I know that they wont be as tough as a 6 ply trail tire, but I can still keep my XC tires & wheels for trails. Any help or info on sizing or how many paddles needed. Gearing is 15/40 as of now. Thanks.