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

Example: Forward B-2 (SyncReverser™ Transmission) at 2200 engine rpm with 480/70R28 tires.

8.51 km/h (5.29 mph) x 0.96 = 8.17 km/h (5.08 mph)

Tire Size	Supplier	Correction Factor
480/70R28	Continental	0.96
16.9R30 (420/85R30)	Michelin	1.00
16.9R30 (420/85R30)	Continental	1.00
18.4R30	Continental	1.05
16.9R34 (420/85R34)	Michelin	1.07
16.9R34 (420/85R34)	Continental	1.08
480/70R34	Michelin	1.08
480/70R34	Continental	1.07
540/65R34	Michelin	1.06
540/65R34	Continental	1.07
320/85R36	Michelin	0.99
13.6R38	Continental	1.07
23.1-26	Titan	1.00
160/95R46	Mitas	1.03

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.