I think that the only reason industry pushes any product, is so they make more money from their customer. Radial vs Bias, from my point of view, there is little difference when it comes to type performance. Radials cost more, but produce little if any cutting edge performance, what baloney, there is little advantage over bias. Save some money, they are combine tires for goodness sake, performance is not a requirement! My 2 scents worth.