Technical Criteria for Agricultural Tyre Selection
Tractor tyres must withstand heavy torsional forces during tillage while maintaining road stability.
Key selection factors:
- Rim matching: Selecting correct tyre dimensions (such as 12.4-28, 13.6-28, 14.9-28) specified by the tractor manufacturer.
- Ply rating (PR): Choosing between 8 PR and 12 PR ratings based on whether the tractor performs field tillage or heavy commercial haulage.
- Lug angle and curvature: Deep lugs with 23-degree or 45-degree angles provide self-cleaning action in damp soils.
Optimizing Field Traction and Soil Health
Proper tyre setup reduces ground pressure and improves field pulling efficiency.
Field management practices:
- Radial vs bias tyres: Radial tractor tyres create a squarer footprint, reducing soil compaction and delivering lower rolling resistance.
- Water ballasting: Filling rear tyres up to 75 percent with water or calcium chloride solution provides non-suspended weight to minimize wheel slip during deep ploughing.
- Matching 4WD tyres: Ensuring exact lead-lag ratios between front and rear rolling circumferences on four-wheel drive tractors.
Tractor Tyre Maintenance and Longevity Checklist
Proactive maintenance prevents premature tyre failure and excessive diesel consumption.
Routine inspection steps:
- Pressure calibration: Adjust pressures lower for field tillage to maximize footprint, and higher for highway trolley haulage.
- Visual inspection: Check weekly for embedded gravel, sidewall cuts, or uneven shoulder wear caused by improper toe-in alignment.
- Storage protection: Shield tyres from direct sunlight, oil spills, and agrochemical runoff when tractors remain parked off-season.
Official source
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Common questions
What does ply rating mean on an agricultural tyre?
The ply rating indicates the carcass strength and load-carrying capacity of the tyre casing, with higher ratings offering greater puncture resistance.
How does incorrect tyre pressure impact farm operations?
Under-inflation risks sidewall cracking, while over-inflation reduces the ground contact patch, increases wheel slippage, and burns excess fuel.
What is the purpose of adding liquid ballast to rear tyres?
Liquid ballasting adds weight directly to the drive axle, increasing tractive pull and eliminating wheel slip during heavy tillage.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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