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 - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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