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 or Creeper Transmission Ground Speed Estimates for correct transmission in this section by the correction factor for the appropriate tire found in the table below.
Example: B-2 (SyncShuttle™ Transmission) 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 |
| 22.5LL-16.1 R3 |
0.70 |
| 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 |
| 13.6-38 R2 (Hi-Crop) |
1.09 |
| 9.5R48 R1 (Veggie) |
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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