Correction Factors for Other Tire Sizes
To calculate ground speeds for tractors equipped with rear tires other than 14.9-28 R1 tires, multiply the ground speeds shown for the 14.9-28 R1 tires in SyncReverser™ Transmission Ground Speed Estimates or Creeper Transmission Ground Speed Estimates in this section by the correction factor for the appropriate tire found in the table below.
Example: B-2 (SyncReverser™ Transmission) at 2400 engine rpm with 12.4-24 R1 tires.
4.1 mph (6.5 km/h) x 0.85 = 3.5 mph (5.6 km/h)
| Tire Size |
Correction Factor |
| 18.4-16.1 R1 |
0.84 |
| 12.4-24 R1 |
0.85 |
| 13.6-24 R1 |
0.87 |
| 14.9-24 R1 |
0.92 |
| 16.9-24 R1 |
0.96 |
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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