Correction Factors for Other Tire Sizes
To calculate ground speeds for tractors equipped with rear tires other than 12.4-24 R1 tires, multiply speeds shown in GROUND SPEED ESTIMATES by the correction factor for the appropriate tire size found in the table.
Be sure to use correct ground speed estimate for your transmission type (PowrReverser™ or PowrReverser™ with Hi/Lo).
Example: Forward B-2 (PowrReverser™ Transmission) at 2400 engine rpm with 18.4-16.1 R1 tires.
5.23 km/h (3.25 mph) x 0.94 = 4.92 km/h (3.06 mph)
| Tire Size |
Correction Factor |
| 18.4-16.1 R1 |
0.94 |
| 13.6-24 R1 |
1.01 |
| 14.9-24 R1 |
1.04 |
| 16.9-24 R1 |
1.10 |
| 14.9-28 R1 |
1.13 |
NOTE:
Speed and correction factor information above are based on rolling circumference information from Firestone Farm Tire Data Book. Rolling circumference dimensions for "like" size tires vary by manufacturer.
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