There is no law saying you HAVE to fill the tire right to the brim with fluid. You could take the fluid out of your old tire and put it in the new tire, and be right at the same weight as you were before, save the difference in rubber weight of the rear tires.
The issue with putting a way-wider tire on a rim is that the rim pulls the sidewalls in, causing the tread to have a rounded profile and less contact with the ground than it would have if it were on a proper rim. Long term this will result in an odd wear pattern with the center of the tread wearing out long before the outside corners.
I have 15.5x38's on 12" rims and they don't look any different than 14.9's width wise. I also have a set of 13.6x38's on 11" rims and they are badly squeezed. You'd think I'd learn but I can't take credit for one of the installations. Bought the tractor that way.
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Today's Featured Article - Tractor Profile: Allis-Chalmers WD45 (Gas Version) - by Staff. Beginning production in 1953, the WD45 had the same general look as the WD tractor which was produced earlier - but was much more powerful. This was due to the new 4-cylinder "Power Crater" gasoline engine with a 4 x 4-1/2 inch bore and stroke. Some people feel this was one of the most significant tractors offered by Allis-Chalmers in those days. Nothing in its weight or power class could match its performance. In 1954 they began offering the WD45 with the new "Snap-Coupler&quo
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