The tractor was designed for 12-38 (13.6 "new designation). 14.9's will reduce the power to the ground because the increased height increases ground speed. The rims are not necessarily the same. 13.6's are ok on an 11 or 12 inch wide rims. 13-38's (14.9 "new" designation) are designed for 12 or 13 inch rims. It would not surprise me at all if you are looking at 14.9's on an 11 inch rim, at most 12. Because most people think the wider tires look better and ignore the rim size. Narrow rims pinch the tire making the tread curved instead of nearly flat, thus less traction instead of more.
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Today's Featured Article - Picking Corn - by Rick Nikolich. It was the day before Christmas shutdown at work and I asked our lead engineering expert Scott Andrzejewski what he was going to do over the holidays. He said that he had some corn that he still needed to pick with an antique one-row New Idea corn picker. Scott has a nice farm about an hour north of Lansing in St. Johns, MI. He wanted to get the rest of his corn in by the next day (Christmas Eve). We had about an inch of new snow on the ground and single digit temperatures. So in the bac
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