🌾⚙️ Farm Equipment
Tire Size Calculator

Calculate optimal tire sizes for farm equipment including combines, grain carts, implements, and harvesters with focus on flotation and soil compaction.

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Combines
Harvesters
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Flotation
IF/VF Tech
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Soil Health
Low Compaction

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💡 Tip: Tire size format is Width/AspectRatio R WheelDiameter
Example: 235/45R18

Enter tire size to see visualization

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Farm Equipment-Specific Requirements

Farm equipment tires prioritize soil protection. Use IF technology minimum for combines and grain carts (20% less pressure). VF technology for high-value crops (40% less pressure, 5-15% yield gain). Run lowest safe PSI for conditions. Monitor compaction in wet fields.

🌾⚙️ Farm Equipment Tire Essentials

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Flotation Tires Explained

Flotation tires = extra-wide, low-pressure tires that 'float' on soil vs sinking. Example: 900/60R32 = 35.4" wide, distributes 10,000+ lbs over large area. Reduces soil compaction by 30-50% vs standard. Critical for: combines, grain carts, sprayers. IF (Increased Flexion) and VF (Very Increased Flexion) technologies allow even lower pressures.

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IF vs VF Technology

Standard tire: baseline load at 25 PSI. IF (Increased Flexion): carry same load at 20 PSI (-20% pressure), OR carry 20% more load at same PSI. VF (Very Increased Flexion): same load at 15 PSI (-40% pressure), OR 40% more at same PSI. VF reduces compaction 35-50%. Critical for heavy combines (70,000+ lbs). IF costs +30%, VF costs +60-80%.

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Soil Compaction Impact

Soil compaction reduces crop yields 10-35% permanently. Combine during harvest: 70,000-90,000 lbs total weight. Grain cart full: 50,000-70,000 lbs. Solutions: VF tires (15 PSI vs 25 PSI), dual/triple tire setups, tracks. VF tires reduce compaction 40% = 5-15% yield gain over 5 years. Worth $10,000-20,000 investment for large operations.

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Implement Tire Types

I-series (I1/I2/I3) for implements: I1 (Highway) = smooth, hay wagons, road transport. I2 (All-Purpose) = moderate tread, general implements. I3 (Traction) = deeper lug, field cultivators. NHS (Non-Highway Service) common. Implement tires prioritize low soil disturbance and even load distribution. Lower pressure (10-20 PSI) than tractor tires.

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Metric Flotation Sizing

Flotation sizes: 900/60R32 = 900mm width (35.4"), 60% aspect ratio, Radial, 32" rim. Width is key - 800mm = 31.5" wide, 900mm = 35.4", 1050mm = 41.3". Wider = more flotation, less compaction. Height = (width × aspect% × 2) + rim diameter. Example: 900/60R32 = (900 × 0.60 × 2)/25.4 + 32 = 74.3" tall.

Tire Strategy for Farm Equipment

Standard to IF Flotation

Reduce compaction 20-25%

Recommended Tire
Michelin CerexBib 2 IF or Trelleborg TM1060
Benefits:
  • ✓20% lower pressure (20 vs 25 PSI)
  • ✓20-25% less compaction
  • ✓Carry 20% more load if needed
  • ✓Yield protection
Trade-offs:
  • •30% higher cost
  • •$2,000-3,000/tire
  • •Requires IF-compatible equipment

Standard to VF Extreme Flotation

Maximum soil protection

Recommended Tire
Michelin AxioBib IF/VF or Alliance 363 VF
Benefits:
  • ✓40% lower pressure (15 vs 25 PSI)
  • ✓35-50% less compaction
  • ✓Carry 40% more at same PSI
  • ✓5-15% yield gain long-term
Trade-offs:
  • •60-80% higher cost
  • •$3,500-5,000/tire
  • •ROI over 5+ years

Single to Dual/Triple Setup

Distribute weight over more tires

Recommended Tire
BKT Flotation or Firestone Radial 9000
Benefits:
  • ✓50% more contact area
  • ✓Reduced rutting
  • ✓Better traction in wet
  • ✓More tire options
Trade-offs:
  • •Complex installation
  • •Dual wheel costs
  • •Wider machine footprint

Top Farm Equipment Tire Brands

Michelin

CerexBib 2 IF/VF
$$$$
Combine Flotation
•IF/VF technology
•Ultraflex casing
•Industry-leading
•5+ year warranty
Available in 900/60R32 IF/VF, 1050/50R32 VF, 800/65R32 IF sizes

Trelleborg

TM1060 Progressive
$$$
Grain Cart IF
•IF technology
•High load capacity
•Good wet traction
•Durable casing
Available in 800/65R32 IF, 900/60R38 IF, 710/70R42 sizes

BKT

Flotation 648
$$
Implement Flotation
•Budget-friendly
•Wide footprint
•Low soil disturbance
•Good value
Available in 500/60-22.5, 550/60-22.5, 600/55-26.5 sizes

Alliance

363 Agri Star VF
$$$$
VF Extreme
•VF technology
•40% flexion
•Maximum flotation
•Mining-grade casing
Available in 900/60R32 VF, 1050/50R32 VF, 800/70R38 VF sizes

Firestone

Radial 9000
$$
Implement Standard
•Proven reliability
•Good tread life
•Wide availability
•Value pricing
Available in 520/85R42, 480/80R46, 380/90R46 sizes

Official Farm Equipment OEM Tire Specifications

ModelYearFrontRearLoad IndexPressure
John Deere
S780 Combine
2024900/60R32 IF520/85R42178/16820/23 PSI
Case IH
9250 Axial-Flow
20241050/50R32 VF520/85R42184/16815/23 PSI
Brent
Grain Cart 1594
2024900/60R38 VF900/60R38 VF18116 PSI
🌾 Important: Farm equipment prioritizes soil protection through IF/VF flotation tires. VF technology reduces compaction by 40% for yield protection.

Farm Equipment Tire FAQs

What are IF and VF tires for farm equipment?
IF (Increased Flexion): carry same load as standard tire but at 20% lower pressure (20 PSI vs 25 PSI), reduces compaction 20-25%, costs +30%. VF (Very Increased Flexion): same load at 40% lower pressure (15 PSI vs 25 PSI), reduces compaction 35-50%, costs +60-80%. Essential for heavy combines (70,000+ lbs) and grain carts. VF worth it for high-value crops - ROI from yield protection.
What tire size for combine harvester?
Modern combines use flotation tires: Front: 900/60R32 IF or 1050/50R32 VF (35-41" wide). Rear: 520/85R42 or 480/80R50. IF technology minimum for Class 7-8 combines (S780, 9250). VF for Class 9-10 (X9, 9260). Front tires carry 60% of weight. Wider front = less compaction. 1050mm VF reduces ruts 40% vs 900mm standard.
How much tire pressure for grain cart?
Grain carts run LOW pressure for flotation. Standard tires: 23-28 PSI. IF tires: 18-23 PSI. VF tires: 12-18 PSI. Empty cart: can run -5 PSI. Full cart (60,000 lbs): max pressure. Example: 900/60R38 VF at 16 PSI carries 70,000 lbs total. Lower pressure = wider footprint = less compaction. Critical in wet harvest conditions.
Are VF tires worth the cost for combines?
YES for large operations and high-value crops. VF costs +60-80% ($3,500-5,000/tire vs $2,000-2,500 standard). Benefits: 35-50% less soil compaction, 5-15% yield gain over 5 years from reduced compaction, can harvest in wetter conditions (extra days). ROI: 3-7 years. Worth it if: 500+ acres, $5+ crops, heavy clay soil. Skip VF for small operations or sandy soils.
What implement tires for field equipment?
Implements use I-series tires: I1 (Highway/Smooth) for hay wagons, road transport. I2 (All-Purpose) for general implements - most common. I3 (Traction) for field cultivators, seeders. Common sizes: 11L-15, 12.5L-15, 31x13.50-15 NHS. Run low pressure (10-20 PSI) to minimize soil disturbance. Replace when tread depth below 50% - worn tires compact more.

Tire Size Comparison Tool

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