Correction Factors for Other Tire Sizes
To calculate ground speeds for tractors equipped with rear tires other than 16.9-30 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 (SyncShuttle™, PowrReverser™ or PowrReverser™ with Hi/Lo). Use creeper transmission ground speed estimates, if so equipped.
Example: Forward B-2 (SyncShuttle™ Transmission) at 2400 engine rpm with 16.9-24 R1 tires.
8.51 km/h (5.29 mph) x 0.90 = 7.66 km/h (4.76 mph)
| Tire Size |
Correction Factor |
| 21.5L-16.1 R3 |
0.74 |
| 22.5LL-16.1 Turf Special |
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 |
| 420/90R30 R1 |
1.00 |
| 230/95R40 R1 (Hi-Crop) |
1.01 |
| 480/80R30 R1W |
1.04 |
| 15.5R38 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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