2019 Isuzu NPR Tire Size, Pressure & Specs

Quick answer

• OEM Tire Size: 215/85R16E
• Recommended Cold Tire Pressure (Placard): 80 psi (front), 80 psi (rear)
• Max Load Inflation Pressure: 80 psi
• Bolt Pattern (Lug Pattern): 6x222.25 mm (6x8.75 in)
• Wheel Size: 16x6 inches
• Load Index & Speed Rating: 115/112L
• Spare Tire Size: Full-size spare (215/85R16E)
• TPMS System: The 2019 Isuzu NPR does not come standard with a TPMS system.

Tire sizes by trim

The 2019 Isuzu NPR series, including the NPR, NPR-HD, NPR-XD, and NQR, primarily uses a single standard tire size for all trims to meet its commercial-grade requirements.

This single sizing ensures that the vehicle meets the strict load-carrying requirements for its class. The "E" in the tire size designation stands for Load Range E, indicating a 10-ply rating, which is essential for the vehicle's payload capacity.

Recommended replacement tires

Choosing the right replacement tire for a commercial vehicle like the Isuzu NPR is critical for safety, longevity, and operating costs. The focus is on durability, load capacity, and tread life. Here are 3 popular replacement options:

• $$$ (Premium): Michelin Agilis CrossClimate - This is a top-tier commercial-grade tire known for its exceptional durability, all-season traction (including snow), and long tread life. It’s an investment that pays off in reduced downtime and excellent performance in various weather conditions.
• $$ (Mid-Range): Goodyear Wrangler Fortitude HT (Commercial) - A workhorse tire that offers a great balance of durability, price, and all-season performance. It's designed specifically for commercial trucks and provides a stable, comfortable ride and reliable handling under heavy loads.
• $ (Budget): Kumho Crugen HT51 - For operators prioritizing upfront cost, the Crugen HT51 is a solid budget-friendly option. While it may not offer the same tread life as premium competitors, it provides reliable performance and meets all the necessary load requirements for the NPR.

When to inflate to max load psi

Unlike consumer pickup trucks where tire pressure varies based on load, the 2019 Isuzu NPR is a medium-duty commercial truck designed to operate at or near its gross vehicle weight rating (GVWR).

For this reason, the tires should always be inflated to the 80 psi specified on the door placard for both front and rear axles. This pressure is the "max load" pressure and is required to safely support the vehicle's intended cargo and operational weight. Under-inflating these tires can lead to excessive heat buildup, premature wear, and a significantly increased risk of a blowout, which is extremely dangerous in a vehicle of this size.

Lug nut torque & pattern

Properly torquing the lug nuts on an Isuzu NPR is critical for safety. Loose lug nuts can cause wheel wobble and, in a worst-case scenario, wheel separation. Over-torquing can warp the brake rotors or damage the wheel studs.

• Lug Nut Torque Spec: 300-350 lb-ft (407-475 Nm). Always use a calibrated torque wrench.
• Lug Pattern: 6x222.25 mm (6x8.75 in)
• Retorque Procedure: It is critical to re-torque the lug nuts after the first 50-100 miles of driving after a wheel has been installed. This ensures they are properly seated.

Common tire issues for this vehicle

Due to their heavy-duty commercial use, Isuzu NPR trucks experience specific tire-related challenges:

• Overloading: While the NPR is built to haul, consistently exceeding the GVWR puts immense strain on the tires, leading to rapid wear and a high risk of failure.
• Alignment & Suspension Wear: The front axles on these cab-over trucks can take a beating. Worn kingpins, tie rods, and improper alignment will cause rapid, uneven wear on the front steer tires—most commonly seen as "cupping" or edge wear.
• Mismatched Rear Duals: When replacing a single tire on the dual rear axle, it's crucial that the new tire's diameter matches the existing one. A mismatched pair (due to wear or different models) will cause the larger tire to carry more weight, leading to scrubbing, rapid wear, and potential axle strain.

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