2017 Isuzu NPR Tire Size, Pressure & Wheel Specs

As an ASE-certified master technician who has serviced fleets of commercial cab-over trucks, I know that keeping your 2017 Isuzu NPR on the road means getting the tire specs exactly right. Whether you are running a standard gas NPR or an NPR-HD diesel, proper tire maintenance prevents blowouts, maximizes fuel economy, and keeps your cargo safe. Below is the ultimate tire and wheel spec reference guide for the 2017 Isuzu NPR.

Quick answer: 2017 Isuzu NPR Tire & Wheel Specs

Here are the essential tire and wheel specifications you need for a standard 2017 Isuzu NPR:

• OEM tire size: 215/85R16 (Standard NPR) or 225/70R19.5 (NPR-HD)
• Recommended cold tire pressure (front/rear): 80 PSI / 80 PSI (for 16-inch tires); 95–110 PSI (for 19.5-inch HD tires, check door placard for exact payload specs)
• Bolt pattern: 6-lug (6x222.25mm or 6x8.75")
• Wheel size: 16x6.0 inches or 19.5x6.0 inches
• Load index/speed rating: 115/112 L (Load Range E) for 16-inch; 128/126 L (Load Range F or G) for 19.5-inch
• Spare tire size: Full-size matching spare
• TPMS frequency: N/A (Standard commercial trucks in this weight class typically do not come with factory light-duty TPMS; aftermarket systems usually operate at 433 MHz)

Tire sizes by trim

The exact tire size on your 2017 Isuzu NPR depends on the Gross Vehicle Weight Rating (GVWR) and whether it is a standard or Heavy Duty (HD) model. Both setups utilize a Dual Rear Wheel (DRW) configuration.

Recommended replacement tires

When outfitting a commercial truck, you need tires that can handle heavy scrub, urban curbing, and constant loads. Here are my top recommendations based on durability and cost-per-mile:

• Premium Tier: Michelin Agilis CrossClimate (16") or Michelin XZE (19.5") – Exceptional tread life, excellent all-weather grip, and reinforced sidewalls to prevent curb damage.
• Mid-Range Tier: Firestone Transforce HT2 (16") or Bridgestone R238 (19.5") – A solid, reliable commercial highway rib tire that balances upfront cost with long-haul durability.
• Budget Tier: Sailun S637 (19.5") or Nexen Roadian CT8 HL (16") – Highly popular in commercial fleets for offering decent mileage and heavy load carrying capacity at a fraction of the premium price.

When to inflate to max load psi

Because the Isuzu NPR is a heavy-duty commercial truck, tire pressure management is directly tied to your payload.

For the 16-inch tires (Load Range E), the max cold pressure is typically 80 PSI. You should always run these at 80 PSI in the rear when carrying near the maximum GVWR (usually 12,000 to 13,000 lbs for standard NPRs).

For the 19.5-inch tires (Load Range F or G) on the NPR-HD, max pressure can range from 95 PSI to 110 PSI. If your box truck is loaded to its maximum capacity (up to 14,500 - 16,000 lbs GVWR), you must inflate the rear tires to the max PSI listed on the tire's sidewall and the driver's side door placard. Running at maximum PSI reduces sidewall flex, minimizes heat buildup, and prevents catastrophic blowouts under heavy loads. If the truck is completely empty, you can slightly lower the front pressure for ride comfort, but commercial fleets generally keep them near max to avoid under-inflation when drivers forget to air them back up before a load.

Lug nut torque & pattern

Commercial truck wheels require serious torque. The 2017 Isuzu NPR features a 6-lug (6x222.25mm) bolt pattern.

• Lug Nut Torque: The standard specification for the 6-stud Budd-style flat-faced wheels on Isuzu NPRs is extremely high compared to passenger trucks. You must torque them to 362 lb-ft (500 Nm).
• Procedure: Always use a calibrated heavy-duty torque wrench or a torque multiplier. Tighten the lug nuts in a crisscross (star) pattern to ensure the wheel sits perfectly flush against the hub. Re-torque the wheels after the first 50 to 100 miles of driving following a wheel removal.

Common tire issues for this vehicle

Working on these trucks daily, I see a few recurring tire issues:

1. Inner Dual Flat/Under-inflation: Because the inner rear tire is hard to reach, drivers often skip checking its pressure. This leads to the inner tire running flat, forcing the outer tire to carry the entire load, which quickly destroys both tires. Use valve stem extensions to make checking easier.
2. Front Tire Cupping: Heavy diesel engines over the front axle combined with stop-and-go city driving can cause front tires to cup or feather. Regular rotation (moving steer tires to the drive axle) and strict adherence to alignment schedules are critical.
3. Curbing Damage: Delivery trucks operate in tight urban spaces. Sidewall damage from scrubbing curbs is incredibly common on the right-side tires. Inspect sidewalls weekly for deep cuts or exposed cords.

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