Correction Factors for Other Tire Sizes

Actual speed varies due to a number of factors. Factors , such as, but not limited to, rolling circumference, load, tire pressure, make of tire, and wheel slip. If the precise speed is required for specific applications, then measurement is necessary.

The following table is used to calculate ground speeds for machines equipped with rear tires other than 480/70R28 Mitastires. Multiply speeds shown in “Ground Speed Charts” in this section 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 (16/16, or 32/16 Transmission). Use creeper transmission ground speed estimates as required.

Example: Forward Low B-3 (32/16 Transmission) at 2200 engine rpm with 420/85R38 (16.9R38) Michelin tires.

6.63 km/h (4.11 mph) x 1.18 = 7.8 km/h (4.8 mph)

Tire Size	Tire Brand	Correction Factor
21.5L-16.1	Firestone	0.77
22.5LL-16.1	Galaxy	0.81
19.5L-24 In.	Goodyear	0.93
480/70R28	Mitas	1.00
12.4R36	Michelin	1.04
23.1-26	Titan	1.04
16.9R30 (420/85R30)	Michelin	1.04
16.9R30 (420/85R30)	Mitas	1.05
16.9-30	Titan	1.05
380/85R34 (14.9R34)	Michelin	1.06
13.6R38 (340/85R38)	Mitas	1.10
18.4R30 (460/85R30)	Mitas	1.10
18.4R30 (460/85R30)	Firestone	1.11
540/65R34	Michelin	1.11
540/65R34	Mitas	1.12
480/70R34	Mitas	1.12
16.9R34 (420/85R34)	Michelin	1.12
480/70R34	Michelin	1.12
16.9R34 (420/85R34)	Mitas	1.13
600/65R34	Michelin	1.16
600/65R34	Mitas	1.17
270/95R44	Kleber	1.17
480/80R34	Nokian	1.17
18.4R34 (460/85R34)	Michelin	1.17
540/65R38	Michelin	1.18
15.5R38 In. (380/85R38)	Firestone	1.18
480/80R34	Nokian	1.18
16.9R38 (420/85R38)	Michelin	1.18
230/95R48	Kleber	1.19
540/65R38	Mitas	1.19
16.9R38 (420/85R38)	Mitas	1.21