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 - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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