Understanding tractor tire sizes is essential for proper performance, traction, and equipment longevity.
This guide provides a comprehensive tractor tire size chart in table format, covering common agricultural, industrial, and turf tire sizes.
Tractor Tire Size Chart
| Standard Size | Metric Equivalent | Rim Diameter (in) | Tire Width (mm) | Aspect Ratio |
|---|---|---|---|---|
| 8.3-20 | 210/85R20 | 20 | 210 | 85 |
| 9.5-20 | 240/85R20 | 20 | 240 | 85 |
| 10.5-20 | 270/85R20 | 20 | 270 | 85 |
| 11.2-20 | 280/85R20 | 20 | 280 | 85 |
| 12.4-20 | 320/85R20 | 20 | 320 | 85 |
| 13.6-20 | 340/85R20 | 20 | 340 | 85 |
| 14.9-20 | 380/85R20 | 20 | 380 | 85 |
| 16.9-20 | 420/85R20 | 20 | 420 | 85 |
| 8.3-24 | 210/85R24 | 24 | 210 | 85 |
| 9.5-24 | 250/85R24 | 24 | 250 | 85 |
| 10.5-24 | 270/85R24 | 24 | 270 | 85 |
| 11.2-24 | 280/85R24 | 24 | 280 | 85 |
| 12.4-24 | 320/85R24 | 24 | 320 | 85 |
| 13.6-24 | 340/85R24 | 24 | 340 | 85 |
| 14.9-24 | 380/85R24 | 24 | 380 | 85 |
| 16.9-24 | 420/85R24 | 24 | 420 | 85 |
| 18.4-24 | 460/85R24 | 24 | 460 | 85 |
| 9.5-28 | 250/85R28 | 28 | 250 | 85 |
| 11.2-28 | 280/85R28 | 28 | 280 | 85 |
| 12.4-28 | 320/85R28 | 28 | 320 | 85 |
| 13.6-28 | 340/85R28 | 28 | 340 | 85 |
| 14.9-28 | 380/85R28 | 28 | 380 | 85 |
| 16.9-28 | 420/85R28 | 28 | 420 | 85 |
| 18.4-28 | 460/85R28 | 28 | 460 | 85 |
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Rear Tractor Tire Size
| Standard Size | Metric Equivalent | Rim Size (in) | Overall Diameter (in) | Section Width (in) |
|---|---|---|---|---|
| 11.2-36 | 280/85R36 | 36 | 61 | 11.2 |
| 12.4-36 | 320/85R36 | 36 | 63 | 12.4 |
| 13.6-36 | 340/85R36 | 36 | 66 | 13.6 |
| 14.9-36 | 380/85R36 | 36 | 67 | 14.9 |
| 15.5-38 | 400/85R38 | 38 | 68 | 15.5 |
| 16.9-34 | 420/85R34 | 34 | 64 | 16.9 |
| 18.4-34 | 460/85R34 | 34 | 66 | 18.4 |
| 20.8-34 | 520/85R34 | 34 | 70 | 20.8 |
| 18.4-38 | 460/85R38 | 38 | 70 | 18.4 |
| 20.8-38 | 520/85R38 | 38 | 73 | 20.8 |
| 24.5-32 | 620/75R32 | 32 | 74 | 24.5 |
| 28L-26 | 700/65R26 | 26 | 69 | 28.0 |
| 30.5L-32 | 800/65R32 | 32 | 75 | 30.5 |
| 18.4-42 | 460/85R42 | 42 | 73 | 18.4 |
| 20.8-42 | 520/85R42 | 42 | 76 | 20.8 |
| 24.5-38 | 620/75R38 | 38 | 75 | 24.5 |
Related John Deere Tire Pressure Chart(For All Models)
Front Tractor Tire Size
| Standard Size | Metric Equivalent | Rim Size (in) | Overall Diameter (in) | Section Width (in) |
|---|---|---|---|---|
| 4.00-12 | 110/90R12 | 12 | 21 | 4.0 |
| 4.50-14 | 120/85R14 | 14 | 23 | 4.5 |
| 5.00-15 | 140/80R15 | 15 | 25 | 5.0 |
| 5.50-16 | 140/85R16 | 16 | 27 | 5.5 |
| 6.00-16 | 160/80R16 | 16 | 28 | 6.0 |
| 6.50-16 | 180/75R16 | 16 | 29 | 6.5 |
| 6.00-19 | 150/90R19 | 19 | 30 | 6.0 |
| 6.50-20 | 170/80R20 | 20 | 32 | 6.5 |
| 7.50-20 | 200/75R20 | 20 | 34 | 7.5 |
| 8.00-20 | 210/75R20 | 20 | 35 | 8.0 |
| 9.00-20 | 230/75R20 | 20 | 36 | 9.0 |
| 10.00-20 | 260/75R20 | 20 | 38 | 10.0 |
| 11.00-20 | 280/75R20 | 20 | 40 | 11.0 |
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R1, R2, R3, R4 Tractor Tire
| Tire Type | Application | Sizes | Ply Rating | Recommended PSI |
|---|---|---|---|---|
| R1 | Agriculture | 8.3-24, 9.5-24, 11.2-24, 13.6-28, 16.9-34, 18.4-38, 20.8-38 | 6–10 Ply | 18–28 PSI |
| R2 | Rice/Swamp | 13.6-28, 14.9-24, 16.9-30, 18.4-34, 20.8-38 | 8–12 Ply | 20–30 PSI |
| R3 | Turf | 16×6.50-8, 18×8.50-8, 20×10.00-10, 24×12.00-12 | 4–6 Ply | 10–18 PSI |
| R4 | Industrial | 8-16.5, 10-16.5, 12.5-20, 14-17.5, 19.5L-24 | 6–12 Ply | 25–45 PSI |
Compact Tractor Tire Size
| Front Tire Size | Rear Tire Size | Tractor HP Range | Rim Size (Front/Rear) | Application |
|---|---|---|---|---|
| 16×6.50-8 | 24×12.00-12 | 12–20 HP | 8 / 12 | Lawn care |
| 18×7.00-8 | 26×12.00-12 | 15–25 HP | 8 / 12 | Residential |
| 20×8.00-10 | 28×12.50-15 | 20–30 HP | 10 / 15 | Light utility |
| 22×8.50-12 | 30×12.50-15 | 25–35 HP | 12 / 15 | Landscaping |
| 24×9.50-12 | 32×12.50-16 | 30–40 HP | 12 / 16 | Farming |
| 26×10.50-12 | 34×12.50-16 | 35–45 HP | 12 / 16 | Heavy-duty |
| 28×11.00-14 | 36×14.00-16 | 40–55 HP | 14 / 16 | Mixed use |
| 29×12.50-15 | 44×18.00-20 | 50–70 HP | 15 / 20 | Commercial |
Related Lawn Mower Tire Pressure Chart(For All Brands + Models)
Tractor Tire Load and Inflation
| Tire Size | Load Capacity (lbs) | Recommended PSI | Max PSI | Ply Rating |
|---|---|---|---|---|
| 9.5-24 | 2,200 | 16 | 26 | 6 Ply |
| 11.2-28 | 3,000 | 18 | 28 | 6 Ply |
| 12.4-28 | 3,400 | 20 | 30 | 8 Ply |
| 13.6-28 | 3,800 | 20 | 30 | 8 Ply |
| 14.9-30 | 4,500 | 22 | 32 | 8 Ply |
| 16.9-30 | 5,200 | 24 | 35 | 10 Ply |
| 18.4-34 | 6,000 | 26 | 36 | 10 Ply |
| 20.8-38 | 7,500 | 28 | 40 | 12 Ply |
| 24.5-32 | 8,800 | 30 | 42 | 12 Ply |
| 30.5L-32 | 10,500 | 32 | 45 | 14 Ply |
Understanding Tractor Tire Sizes
Tractor tire sizes are typically displayed in two main formats:
- Standard (Inches format): Example: 11.2-24
- Metric (Radial format): Example: 320/85R24
Key Components:
- Width: Tire width in inches or millimeters
- Aspect Ratio: Sidewall height as a percentage of width (metric only)
- Rim Diameter: Size of the wheel the tire fits
- Construction Type: Bias (–) or Radial (R)
Related Cub Cadet Zero Turn Tire Pressure Chart(For All Models)
How to Choose the Right Tractor Tire Size
Selecting the correct tire size depends on several factors:
1. Tractor Type
Compact tractors need smaller tires, while row crop tractors require larger rear tires for traction.
2. Application
- Farming: R1 tires
- Wet fields: R2 tires
- Lawn care: R3 tires
- Construction: R4 tires
3. Load Requirements
Always match tire capacity with the weight of your tractor and implements.
4. Terrain
Rough terrain requires durable, deeper-tread patterns, while smooth surfaces require less aggressive tires.
Tips for Maintaining Tractor Tires
- Check tire pressure regularly
- Avoid overloading
- Store equipment away from direct sunlight
- Rotate tires when possible
- Inspect for cracks, cuts, or wear
Final words
A tractor tire size chart is an essential tool for farmers, landscapers, and equipment owners. Understanding tire sizing, conversions, and applications helps you make informed decisions that improve performance and extend your tractor’s lifespan.
By using the tables above, you can quickly identify the right tire size for your machine, whether you’re working in the field, on turf, or in industrial settings.
