Visited a Mennonite farmer today, delivered a load of oats I grew on my farm. This sect of Mennonites farm with tractors, although they still travel by horse and buggy. His tractor, an older Case had steel wheels. Not the lug type we commonly associate with steel wheels... These were made of a ring of expanded steel, like the metal often found on gratings and decking. The diamond cutouts were probably 4" across, and the metal, probably 1/4" thick. They were approximately 1 foot wide. Asked him if he got good traction with them, and he kinda indicated they could do better. The metal was open to the back, and mud constantly dribbled down on the wheel disk, and axle. Really a mess! He also had a skid-steer loader. Wheels on that looked like the rim was covered with a rubber layer, onto which metal bars had been bolted. Seemed to work OK, flotation seemed good. I had seen other farmers in his neighborhood with smooth metal wheels, with cleats or bars, but these perforated metal wheels seemed quite novel!