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 Plus™, SyncReverser™, PowrReverser™ or PowrReverser Plus™ Transmission). Use creeper transmission ground speed estimates, if so equipped.

Example: Forward B-2 (SyncShuttle Plus™ Transmission) at 2200 engine rpm with 16.9-28 R1 tires.

8.51 km/h (5.29 mph) x 0.97 = 8.25 km/h (5.13 mph)

Tire Size	Correction Factor
22.5LL-16.1 6PR R3 (Turf)	0.70
21.5L-16.1 R3	0.77
19.5L-24 10PR R4	0.88
19.5L-24 10PR R4W	0.88
14.9-28 6PR R1	0.92
16.9-28 8PR R4	0.96
16.9-28 6PR R1	0.97
16.9-30 6PR R1	1.00
420/90R30 142A8 R1	1.00
230/95R40 122A8 R1 (Hi-Crop)	1.01
23.1-26 8PR R3	1.04
480/80R30 145A8 R1W	1.04
15.5R38 125A8 R1	1.07
18.4R30 143A8 R1	1.07
16.9R34 R1W	1.09
420/85R34 142A8 R1W	1.09
340/85R38 133A8 R1W	1.09
13.6-38 R2 (Hi-Crop)	1.09
230/95R48 136A8 R1W (Hi-Crop)	1.15

NOTE: The actual speeds vary with rolling circumference, load, tire pressure, make of tire, wheel slip etc. If the precise speed is required for specific applications, then it must be obtained by measurement.