I just bought a b6100e that minus a few dings is basically new(259 hours). I'm pretty sure it still has the original tires as they are falling apart(literally crumbling). They seem quite hard to find. I know people go up to 12.5 in the rear but is there another option in wheels and tires that would make them easier to find? Since I'm going to need all 4 maybe I can find some used wheels or just buy wheels and tires and come out with something more standard. I'm mostly going to use it as a belly mower and a tiller.