2024 Isuzu NQR Tire Size & Pressure Guide

Quick answer

• OEM Tire Size: 225/70R19.5
• Recommended Cold Tire Pressure (placard): 110 psi (front & rear)
• Bolt Pattern: 6x222.25 mm (6x8.75 in)
• Wheel Size: 19.5 x 6.0 inches
• Load Index/Speed Rating: 128/126L
• Spare Tire Size: Full-size spare (225/70R19.5)
• TPMS Frequency: Not applicable. Commercial trucks of this class do not use standard TPMS systems.

Tire sizes by trim

The 2024 Isuzu NQR comes equipped with a single standard tire size across all configurations.

Recommended replacement tires

Choosing the right commercial truck tire depends heavily on your application (regional haul, pickup & delivery, etc.) and budget. The 225/70R19.5 is a common size, offering a wide range of options.

• $$$ (Premium): Michelin Agilis HD Z - A top-tier steer/all-position tire known for its exceptional durability, long tread life, and fuel efficiency. It features reinforced sidewalls to resist curbing and impacts common in urban environments.
• $$ (Mid-Range): Bridgestone R238 - A highly durable all-position radial tire that provides excellent performance in high-scrub applications. It's a workhorse tire trusted by many fleets for its resistance to irregular wear and overall longevity.
• $ (Budget): Toyo M154 - A reliable and cost-effective all-position tire suitable for regional and urban service. It offers a durable casing and a tread design that promotes even wear and good wet traction.

When to inflate to max load psi

As a medium-duty commercial truck, the 2024 Isuzu NQR is designed to operate at or near its maximum payload capacity. Unlike light-duty pickups where tire pressure is adjusted for comfort when unloaded, the NQR's tires should always be inflated to the 110 psi specified on the door placard.

This pressure ensures the tire can safely support the vehicle's Gross Vehicle Weight Rating (GVWR). Under-inflation is extremely dangerous in a commercial application, leading to excessive heat buildup, premature tire failure, and potential blowouts. Always check pressures when the tires are cold (driven less than one mile) for an accurate reading.

Lug nut torque & pattern

Properly torquing the lug nuts on an NQR is critical for safety. The 6-lug hub requires a specific sequence to ensure the wheel is seated flat against the hub.

• Lug Nut Torque Spec: 300-350 lb-ft (always confirm with the owner's manual or service information).
• Torque Pattern: Use a star or crisscross pattern. Tighten the lug nuts in the sequence 1-4-2-5-3-6. Bring the nuts to a snug fit first, then use a calibrated torque wrench to apply the final torque in stages.

Common tire issues for this vehicle

The Isuzu N-Series trucks are workhorses, and their tire issues are almost always related to the demanding conditions they operate in.

• Curb and Sidewall Damage: The NQR's primary role as a pickup and delivery truck in urban and suburban environments makes it highly susceptible to tire damage from hitting curbs. Drivers should be trained to take wide turns to minimize this.
• Irregular Wear: "Rivering" or "channel wear" can be common on the steer axle tires of commercial trucks. This is often caused by a combination of suspension characteristics and road conditions. Regular tire rotation and using tires designed for high-scrub applications can mitigate this.
• Under-inflation from Slow Leaks: Due to the high pressures, even a small puncture can lead to rapid and dangerous pressure loss. Pre-trip inspections, including a visual check of the tires and using a dedicated truck tire pressure gauge, are the best prevention.

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