25 1/2" from center line of tractor to the inside of the right rear wheel.
"adjust the rear wheels of the tractor so they are equidistant from the center line of tractor.The distance between the center line of the tractor and the inside of the tire is determined by the size of the plow:
23 1/2 " for 12 inch plows,
25 1/2" for 14 inch plows,
and 27 1/2" for 16 inch plows. When plowing at depths greater than 8 inches add 1 inch to the dimensions above."
When in the ground, the plow should be level front to back and right to left.