Something I have been wanting to try for a while...
18.4Rx46 rears with 14.9Rx34 fronts... Front axle moved ahead to 110" wheelbase (from 96" factory setting).
Set at 90" tread at rear in this picture, can go as wide as 95" or reverse wheels and set down to 60", but no hub duals that way...
Fronts are at 84" tread now (widest setting) and can drop down by 4" increments. No wheel stops at wide setting and does not touch frame or hood.
Used standard "stub disc" rear wheels salvaged from a NH Genesis and standard fronts from NH/CIH/JD. Had to drill 4 new holes in each rear wheel to mate up with the Allis 16-hole pattern in the cast center.
And yes, they will clear the cab, but can't use snow chains!
Before the conversion, I had 18.4x38 bias on the rear and 13.6x28 bias on the front. I use this tractor extensively for haying and spraying. It doesn't turn very short when set at 60" for spraying corn, so I have been running 90" and straddling 3 rows, which works pretty well. Leaving the wheels at 90" also lets me straddle large windrows and swaths when haying, so I don't have to move the wheels back and forth. The taller tires will give me a little more ground clearance for spraying and going over tall windrows when round baling.
I gained about 2.5 mph road speed, to about 22-22.5 mph maximum. The top of the drawbar went from 16.5" to 20"; the bottom of the FWA differential went from 16.5" to 20.5" and the bottom of the cab steps went from 21.5" to 25". I may add another step to the bottom of the cab ladders yet. The longer wheelbase, radial tires and larger size tires all add together to make an incredible improvement in the ride in the field and especially on the road!
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