2025 International LT Tire Size & Pressure Guide

Quick Answer

• OEM Tire Size: Varies significantly by configuration (steer, drive, and trailer axles)
• Recommended Cold Tire Pressure: Varies by GAWR and tire size – always refer to the tire placard on the driver's side door jamb.
• Bolt Pattern: 10-hole, 285.75mm bolt circle (standard for most heavy-duty trucks)
• Wheel Size: Typically 22.5" or 24.5" diameter, various widths (e.g., 8.25", 9.00")
• Load Index/Speed Rating: Varies greatly by tire and axle position; heavy-duty commercial tires will have high load ratings (e.g., L, M, N) and appropriate speed ratings (e.g., K, L, M).
• Spare Tire Size: Often configured as a "roadside service" solution rather than a full spare; if present, it will match an installed tire size.
• TPMS Frequency: 433 MHz (common for heavy-duty commercial vehicles)

Tire Sizes by Trim

The 2025 International LT series is a heavy-duty commercial truck, and tire specifications are highly dependent on the exact chassis configuration, Gross Axle Weight Ratings (GAWR), and intended application (e.g., long-haul, regional, vocational). There aren't "trims" in the traditional sense like passenger vehicles, but rather extensive customization options. Below are common tire sizes found on International LT models, but always verify with your vehicle's specific build sheet or tire placard.

Recommended Replacement Tires

When replacing tires on your International LT, prioritize application-specific heavy-duty commercial truck tires. Factors like fuel efficiency, traction (all-position, drive, or trailer), and mileage warranty are key considerations. Here are some popular options across different price tiers:

• Premium Tier:
  • Michelin X Line Energy Z (Steer) / D (Drive): Known for excellent fuel efficiency and long tread life. (Price: $$$$)
  • Goodyear Fuel Max S (Steer) / D (Drive): Designed for fuel economy and strong performance in line-haul applications. (Price: $$$$)
• Mid-Range Tier:
  • Continental Hybrid HS3 (Steer) / HD3 (Drive): Offers a good balance of durability, fuel economy, and traction. (Price: $$$)
  • Bridgestone M799 (Steer) / M775 (Drive): Reliable performance and good mileage for various applications. (Price: $$$)
• Value Tier:
  • Hankook AH37 (Steer) / DH07 (Drive): Provides solid performance and durability at a more budget-friendly price point. (Price: $$)

Always ensure the replacement tires meet or exceed the vehicle's original equipment load index and speed rating requirements.

When to Inflate to Max Load PSI

For heavy-duty trucks like the International LT, "max load psi" (maximum cold inflation pressure molded on the tire sidewall) is critical, but should only be used in specific situations. You should inflate your tires to the maximum load PSI only when the axle is consistently carrying its maximum Gross Axle Weight Rating (GAWR). It is crucial to monitor tire pressure regularly.

Always refer to your vehicle's tire placard (located on the driver's door jamb) for the recommended cold tire pressures. This placard specifies the optimal inflation pressures for various axle loads, ensuring proper handling, tire longevity, and fuel efficiency. Over-inflation or under-inflation can lead to premature tire wear, reduced fuel economy, and compromised safety.

Many fleets utilize tire pressure monitoring systems (TPMS) and regular inflation programs to maintain optimal pressures.

Lug Nut Torque & Pattern

Maintaining correct lug nut torque is paramount for safety on heavy-duty vehicles. Due to the high stresses placed on wheels and axles, improperly torqued lug nuts can lead to wheel separation, damage to wheel studs, and serious accidents.

• Lug Nut Torque: Typically between 450-500 ft-lbs (610-678 Nm). Always refer to the International LT service manual or your fleet's maintenance guidelines for the precise torque specification.
• Torque Pattern: A star or crisscross pattern should be used to ensure even clamping force across the wheel hub. After tightening to initial torque, it is recommended to re-torque the lug nuts after the first 50-100 miles of service on newly mounted wheels, and then at regular maintenance intervals.

Common Tire Issues for this Vehicle

Heavy-duty trucks like the International LT are subject to unique tire wear patterns and issues due to their weight, operating conditions, and mileage. Common issues include:

• Uneven Wear: Often a result of improper inflation, misalignment, worn suspension components, or aggressive driving. Cupping, feathering, and shoulder wear are common symptoms.
• Shoulder Wear: Can indicate consistent under-inflation, over-loading, or aggressive cornering.
• Center Tread Wear: Often a sign of chronic over-inflation.
• Tire Irregularities: Tread separation, bulging sidewalls, or punctures from road debris are risks that require immediate attention.
• Heat Buildup: Under-inflated tires generate excessive heat, which can lead to tire failure. Pre-trip inspections and regular pressure checks are crucial.

Regular inspections, proper inflation, and timely rotation (where applicable, especially on steer axles) are essential to maximize tire life and ensure safe operation.

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