Thanks west. I thought you buy tires and go never put that much thought in to like my race car. So for best over all riding a 21 front and 20 rear is good or go lower I'm going to be in all conditions mx trails mud everything. How about front tire width what's the smallest width you can put on there how about the tire ply I see different thickness where all does this help besides a harder surface for  rock sticks nails  to go into ? I know wider is allway better on rear I think kenda is the only tire that 20/12/10 all terrain tire. They got some wide slicks for the 10 inch rims