I'm new to this site and i have one big question for you guys. Does anyone know where i can get innertubes for 17/40-15 ground hawgs. My tires refuse to hold air even for a little while, i have tried repairing many times but to no avail. Local tire shops say thay have no idea where to find something like that:wtf . I figured maybe tractors have similar tire sizes? sorry for the long post.