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Before buying farm and agricultural tires: tractor, implement and harvester fitments
Farm tires, also called agricultural tires or ag tires, are tires for tractors, combines, sprayers and towed implements, classified by tread codes that describe the job each farm tire is built for. Rear tractor tires carry R codes, front tractor tires carry F codes and implement tires carry I codes; the code is molded on the sidewall next to the size.
Selecting ag tires by tread code and job
- R-1 tractor tires have standard-depth lugs for general field work in average soil.
- R-1W tractor tires have lugs at least 20% deeper than R-1 tires in the same size, for wet soil and longer tread life.
- R-2 tractor tires have lugs twice as deep as R-1 tires, for rice, cane and flooded fields.
- R-3 tractor tires have a shallow turf tread for lawns, golf courses and sod; see lawn and garden tires for smaller equipment.
- R-4 tractor tires have an industrial tread between R-1 and R-3 depth, for compact tractors and backhoes that work on soil and pavement.
- F-2 front tractor tires have three or four ribs for steering on two-wheel-drive tractors.
- I-1 implement tires have a rib tread for free-rolling implements; I-3 implement tires have a traction tread for heavy wagons and spreaders.
Order rear tractor tires in pairs to keep both drive wheels matched.
Farm tire sizes to read before ordering: bias, radial, IF and VF
Bias farm tire sizes such as 18.4-38 give the section width in inches (18.4) and the rim diameter in inches (38). Radial farm tire sizes such as 620/70R46 give the section width in millimeters (620), the sidewall height as a percentage of width (70) and the rim diameter (46). IF (Increased Flexion) radial farm tires carry 20% more load than a standard radial farm tire at the same pressure, and VF (Very High Flexion) radial farm tires carry 40% more.
Choosing bias or radial tractor tires
Radial tractor tires flex at the sidewall and lay a longer footprint than bias farm tires, which reduces soil compaction and wheel slip in the field. Bias farm tires cost less and have stiffer sidewalls, which suit loader work, hillsides and tractors that spend most hours on light duty.
Speed symbols to check when buying farm tires
Farm tire speed symbols set the maximum road speed at the rated load: A8 equals 25 mph, B equals 31 mph and D equals 40 mph. A tractor that runs at higher road speeds between fields needs farm tires with a matching speed symbol.
Ordering farm tires with NeoTires
Farm tires are ordered by the size and tread code molded on the current tire, such as 18.4-38 R-1 or 620/70R46 R-1W, in pairs for drive wheels. Search that size on NeoTires, compare farm and agricultural tires by tread code, load rating and price, and add the pair to the cart. NeoTires dispatches farm tires the same day and ships across the US, with no shipping charge on tires marked Free shipping; Klarna, Affirm and Afterpay financing is offered at checkout for buyers who prefer to pay over time.
Before buying farm and agricultural tires: tractor, implement and harvester fitments
Farm tires, also called agricultural tires or ag tires, are tires for tractors, combines, sprayers and towed implements, classified by tread codes that describe the job each farm tire is built for. Rear tractor tires carry R codes, front tractor tires carry F codes and implement tires carry I codes; the code is molded on the sidewall next to the size.
Selecting ag tires by tread code and job
- R-1 tractor tires have standard-depth lugs for general field work in average soil.
- R-1W tractor tires have lugs at least 20% deeper than R-1 tires in the same size, for wet soil and longer tread life.
- R-2 tractor tires have lugs twice as deep as R-1 tires, for rice, cane and flooded fields.
- R-3 tractor tires have a shallow turf tread for lawns, golf courses and sod; see lawn and garden tires for smaller equipment.
- R-4 tractor tires have an industrial tread between R-1 and R-3 depth, for compact tractors and backhoes that work on soil and pavement.
- F-2 front tractor tires have three or four ribs for steering on two-wheel-drive tractors.
- I-1 implement tires have a rib tread for free-rolling implements; I-3 implement tires have a traction tread for heavy wagons and spreaders.
Order rear tractor tires in pairs to keep both drive wheels matched.
Farm tire sizes to read before ordering: bias, radial, IF and VF
Bias farm tire sizes such as 18.4-38 give the section width in inches (18.4) and the rim diameter in inches (38). Radial farm tire sizes such as 620/70R46 give the section width in millimeters (620), the sidewall height as a percentage of width (70) and the rim diameter (46). IF (Increased Flexion) radial farm tires carry 20% more load than a standard radial farm tire at the same pressure, and VF (Very High Flexion) radial farm tires carry 40% more.
Choosing bias or radial tractor tires
Radial tractor tires flex at the sidewall and lay a longer footprint than bias farm tires, which reduces soil compaction and wheel slip in the field. Bias farm tires cost less and have stiffer sidewalls, which suit loader work, hillsides and tractors that spend most hours on light duty.
Speed symbols to check when buying farm tires
Farm tire speed symbols set the maximum road speed at the rated load: A8 equals 25 mph, B equals 31 mph and D equals 40 mph. A tractor that runs at higher road speeds between fields needs farm tires with a matching speed symbol.
Ordering farm tires with NeoTires
Farm tires are ordered by the size and tread code molded on the current tire, such as 18.4-38 R-1 or 620/70R46 R-1W, in pairs for drive wheels. Search that size on NeoTires, compare farm and agricultural tires by tread code, load rating and price, and add the pair to the cart. NeoTires dispatches farm tires the same day and ships across the US, with no shipping charge on tires marked Free shipping; Klarna, Affirm and Afterpay financing is offered at checkout for buyers who prefer to pay over time.
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