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To measure on the floor to get exactly 20 degrees of steering, cut a 30-inch piece of 1x6-inch wood, or a similar straight, flat piece, and lay it against the tire. Mark midway on the wood (15 inches) and line that up with the center of the hub. Mark the outside corner of each end of the wood. Turn the steering wheel until the ends have moved 531/416 inches and you will have turned the wheel 20 degrees.