Geoff: Your getting led astray here, traction with a tractor is not the same as race cars. tractor tires hardly compare with racing tires. Traction on hard road or black top is quite different from a field situation.
The first year I had my 1066, on single wheels with chloride and with 24' cultivator the tractor would ocasionally loose traction, and continuously leave wheel tracks the culivator would not cover. Not a surface I was very happy to plant corn or drill grain on. I dumped the chloride, installed duals and the tractor pulled the same 24' cultivator, without any loss of traction and gone were the wheel tracks. I also had a 12-15 ton manure spreader, pulled it with those same duals no chloride in summer season. One day on hard frozen ground I went for a ride of my lifetime. I took the duals off, and tractor handled the manure spreader fine on frozen ground. Removing the duals almost doubled the rear tire pounds per square inch on the hard frozen ground. You have to match tire equipment to conditions.
Other factors here, and all manufacturers will warn against this. Do not make maximum drawbar pulls in lower gears with duals. Also, do not add unlimited weight to duals, all tractors must have some slipage. Slipage is the cushion that protects the tractor driveline. This becomes a major concern with articulateds, one must achive the same slipage on both axles, if not the axle with least slipage will have excessive wear
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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