Rubber tires allow for wheel slippage under load, and some wheel slippage is good for efficiency.
Wheel slippage can mean the difference between being stuck plowing in 2nd gear on steel, and plowing in 3rd gear on rubber. She just doesn't quite have enough power to pull in 3rd on steel, but the slippage of the rubber tires lets the tractor wind up and keep moving in 3rd.
Let's say 2nd gear is rated 2MPH, and 3rd is rated 3MPH. With steel you're doing 2MPH in 2nd gear, period. On rubber you might be doing 2.75MPH instead of 3MPH, but it's still .75MPH faster.
Even though the tractor is spinning a little bit on the rubber tires, it's still moving through the field faster and getting more work done.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for �200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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