Correction Factors for Other Tire Sizes
To calculate ground speeds for tractors equipped with rear tires other than 16.9-30, R1 tires, multiply the ground speeds shown for the 16.9-30, R1 tires in Transmission Ground Speed Estimates report for correct transmission in this section by the correction factor for the appropriate tire found in the table below.
Example: B-2 at 2400 engine rpm with 16.9-24 R1 tires.
4.36 mph (7.02 km/h) x 0.90 = 3.92 mph (6.32 km/h)
| Tire Size |
Correction Factor |
| 21.5L-16.1 R3 |
0.74 |
| 16.9-24 R4 |
0.87 |
| 16.9-24 R3 |
0.88 |
| 19.5L-24 R4 |
0.88 |
| 16.9-24 R1 |
0.90 |
| 13.6-28 R1 |
0.90 |
| 14.9-28 R1 |
0.92 |
| 16.9-28 R1 |
0.97 |
| 18.4-30 R1 |
1.04 |
| 15.5-38 R1 |
1.07 |
| 9.5L-48 R1 |
1.17 |
NOTE:
Speed and correction factor information above is 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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