Tire Information





F-1 is free rolling single rib steer tire, best suited for wet mucky soils, typically complementing rear R-2.

F-2 is free rolling 3-Rib steer, general dry land farming tire, typically complementing rear R-1.

F-2M is free rolling 4-Rib steer, general dry land farming tire, typically complementing rear R-1.

I-1 is free rolling multi-rib tire, used on variety of towed implements.

F-I is free rolling multi-rib tire (same tread pattern as I-1); however, it is DOT approved for specified highway service speeds.

R-1 is bar tread drive tire used for general dry land farming.

R-1W is bar tread drive tire (same pattern as R-1), best suited for wet sticky soils, with approx. 20% deeper tread than R-1.

R-2 is bar tread drive tire used for wet mucky soils (rice & cane), with approx. double tread than standard R-1.

R-3 is button tread drive or free rolling tire designed to minimize soil disturbance, approximately half the tread of standard R-1.


SIZE EXPLANATION (How to Read AG Tire Size)


Standard Size


18.4 = Section Width (inches)

R = Radial

42 = Rim Diameter (inches)

*18.4-42 (Dash between Section Width and Rim Diameter) indicates Bias.



Metric Size


480 = Section Width in Millimeters

80 = Aspect Ratio (% of sidewall height to section width)

42 = Rim Diameter (inches)

*Most new tire offerings use Metric Sizing.



Convert Metric Size to Standard Size

Divide the metric number (millimeters) by 25.4 to get inches.

480 Section Width / 25.4 = 18.9 inch section width.



Convert Standard Size to Metric Size

Multiply standard (inches) x 25.4 to get millimeters.

18.4 Section Width x 25.4= 467 millimeter section width.





Bias ply cords extend DIAGONALLY from bead to bead.

Radial cords extend from at RIGHT ANGLES from bead to bead across tread.


Michelin, the creator of the radial tire, has great visual that can be seen by clicking the below link:




Radial is superior to Bias as enables larger footprint, better traction, and reduced fuel.




Ply Rating

Designates maximum load carrying capacity of a specific size tire at maximum air pressure and speed. Predominately reserved for Bias ply.



Star Rating

Designation related to a standard maximum air pressure. *=18 PSI, **=24 PSI, ***= 30 PSI, with Maximum Load varying by size. Star rating system is falling out of favor, with Ag Tire manufacturers preferring Load Index Chart.



Load Index

Designates maximum load carrying capacity of a tire at maximum air pressure and speed, in accordance with Load Index Chart that can be viewed by clicking below link:




Designates maximum speed of tire in accordance with Alphabetical Speed Rating Chart (A to Z).

Ag Tire Speed Ratings


A8 = 25 mph

B = 31 mph

C = 37 mph

D = 40 mph

E = 43 mph

F = 50 mph




480/80R42 with 151B Load Speed Index:

151B = 7600 lbs @ 23 PSI Max Air Pressure at 31 MPH.



Tire identification number stamped on sidewall of Ag tire indicating manufacturing plant, size, date of manufacture, and certifies compliance with U.S. Department of Transportation highway service standards where applicable.




DOT stamp indicates tire is approved for highway service by U.S. Department of Transportation

CF is plant code: Titan Des Moines Iowa

HR is size: 480/80R42 (Optional for Manufacturer)

FOWR is brand or other type: Hi Traction Lug (Optional for Manufacturer)

4202 is date of manufacture: 42nd week of 2002


Manufacture Date note:  Starting in 2000 date coding changed from 3 to 4 digits as shown above.  3 digit 202 means tire was built 1999 or earlier, 20th week of 1992, 1982, or 1972, but not 2002.

Plant Code note: On April 2015 NHTSA (National Highway Traffic Safety Administration) ran out of 2 digit plant codes, changing to 3 digit codes. Existing 2 digit codes will be phased out no later than 2025.


Ag Tire Plant Code Key

AG, 2A6 JK Tornel Tacuba Mexico

A9, 1A9 Titan Tire Bryan Ohio

B4, 1B4 Taurus (Michelin) Budapest, Hungary

B5, 1B5 Stomil (Michelin) Olsztyn Poland

CD, 1CD Alliance Hadera, Israel

CF, 1CF Titan Tire Des Moines Iowa

C4, 1C4 Carlstar Group (Carlisle) Clinton, TN

FO, 1FO Titan Tire, Natchez, Mississippi

FY, 1FY Balkrishna Industries Ltd (BKT) Kutch, Gujarath, India

LH, ILH Speedways Rubber Company, Jalandhar India

LW, 1LW Trelleborg

P4, 1P4 Carlstar Group (Carlisle) Jackson, Tennessee

PK, 1PK Titan Tire, Freeport, IL

UD, 1UD Mitas Tires North America Inc. Charles City, Iowa

VE, 1VD Bridgestone Corporation Des Moines Iowa

WN, 1WN Trelleborg Xingtai, Hebei, China.

3U, 13U Specialty Tire Unicoi Tennessee

3V, 13V Balkrishna Industries (BKT) Waluj, India

4F, 14F JK Tornel Tultitian Mexico

5F, 15F JK Tornel S.A. de C.V.

4L, 14L Carlstar Group (Carlisle) Bu Ji Town China

6I, 261 Michelin / Taurus Nyiregyhaza, Hungary

6J, 16J CGS / Mitas Zlin, Czech Republic

6N, 16N Mewat Tire & Rubber Ltd. Rajasthan, India

8S, 285 Petlas Tire Industry Kireshir, Turkey

9N, 19N Balkrishna Industries Ltd. (BKT)

26, 126 Malhotra Rubber Ltd. Nodia, India

35, 135 Trelleborg Lanka (Pvt.) Ltd. Sapugaskanda, Sri Lanka

54, 154 CGS / Mitas A.S. Prague, Czech Republic




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