What kind of mud is it? Is it hard clay mud? Or softer? Are there rocks in the mix that you have to worry about as well? How fast is the terrain?
The reason I ask the above questions is that I might go with a narrower tire on hard clay - a 130 width michelin s12 versus a 140. Also, if I can, I would run with lower tire pressure, but the speeds and rockiness of terrain will make me tend to stay higher on air pressure. (Add flat proof to ward off pinch flats - it lubricates the inside of the tube and helps in this regard). The lower tire pressure allows the tire to have a larger contact patch - it will fling mud better as the tire deflects coming off the contact patch. Michelins are really wonderful when you don't have to "air them up" for rocks....
If the tires "pack up" with mud - spin the rear tire a little when you can to clear it out and get as much speed as you can in straight sections to clear out the front tire...
jeff
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