2024 Isuzu NPR — Tire Size, Pressure, Bolt Pattern & Wheel Specs

Quick answer

• OEM tire size: LT215/85R16 (dual rear wheels) — Load Range E on most 2024 NPR/NPR‑HD chassis. Always confirm the door placard or certification label for your exact build and body upfit.
• Recommended cold tire pressure (door placard): Typically 65–80 psi front; 80 psi rear duals. Many NPR‑HD builds show 80 psi front and rear at rated GVWR; some gas NPR may list ~65–75 psi front. Follow your placard.
• Bolt pattern: 6x205 mm (medium‑duty 6‑lug). Hub/stud piloting varies by wheel supplier.
• Wheel size and offset: 16x6.0 steel dual wheels. High positive offset/inset typical of dual wheels; inset commonly in the 120–135 mm range depending on wheel supplier. Use OE‑spec inner/outer wheels only.
• Load index/speed rating: Commonly 115/112R to 120/116R in LT215/85R16 (single/dual). Speed rating usually Q–R for commercial all‑season ribs.
• Spare tire: Full‑size 16‑inch dual‑compatible spare matching the service size in most builds.
• TPMS frequency: Many NPR (GVWR >10,000 lb) are not factory‑equipped with TPMS in North America. If equipped (fleet/aftermarket), sensors are commonly 433 MHz, though some systems use 315 MHz — verify with a scan tool.

Tire sizes by trim

Notes:

• Some regional/fleet specs can vary by upfitter and axle ratings. Always go by the tire information placard on the driver door/door jamb or the Isuzu body builder label.
• Heavier N‑Series trims (NPR‑XD/NQR/NRR) typically use 19.5‑inch tires (e.g., 225/70R19.5). Those are separate models; see their specific pages for details.

Recommended replacement tires

Balanced for durability, load, and urban delivery duty in LT215/85R16 dual‑rear service:

• Premium
  • Michelin Agilis CrossClimate LT215/85R16 E — All‑weather commercial tread, exceptional treadlife and wet braking.
  • Bridgestone Duravis R238 LT215/85R16 E — Regional delivery rib, robust casing for frequent curb strikes.
• Mid‑range
  • Firestone Transforce HT2 LT215/85R16 E — Fleet favorite for value and even wear on box trucks.
  • Cooper Discoverer HT3 LT215/85R16 E — Solid highway rib with reinforced shoulders.
• Budget/Severe service
  • Hankook Dynapro HT RH12 LT215/85R16 E — Cost‑effective with good mileage for mixed city/highway.
  • Toyo M‑55 LT215/85R16 E — Severe‑duty/all‑position option where chip‑ and cut‑resistance is a priority.

Tip: For winter operations in snow‑belt regions, consider true winter‑rated commercial patterns and/or approved chains per your fleet policy and local laws.

When to inflate to max load psi

For heavy‑duty trucks like the NPR, use the tire’s max sidewall pressure only when necessary:

• LT215/85R16 Load Range E tires are rated to 80 psi max cold. Inflate to 80 psi when operating near GAWR/GVWR, carrying sustained maximum payload, or running extended highway speeds in hot weather.
• If your chassis uses different tires, follow the tire’s sidewall and load‑inflation tables: 19.5‑inch commercial tires often specify 95–110–120 psi max depending on Load Range (F/G/H), but those apply to NPR‑XD/NQR/NRR, not most NPR/NPR‑HD.
• Do not exceed wheel/rim pressure ratings. Always match inflation to the actual axle weights when possible (scale the truck) and consult the tire maker’s load‑inflation charts.

Lug nut torque & pattern

• Pattern: 6‑lug on 6x205 mm. Use a star/alternating pattern in multiple stages.
• Torque: Common spec range for N‑Series 16‑inch 6‑lug steel wheels is roughly 180–220 lb‑ft (244–298 N·m). Always confirm the exact spec on the wheel tag/Isuzu service information for your VIN and wheel type (stud‑ vs hub‑piloted). Re‑torque after 50–100 miles.
• Hardware: Use only the correct cone or flange nuts for your wheel type; mixing hardware can lead to loss of clamping force.

Common tire issues for this vehicle

• Inner dual wear/heat buildup from under‑inflation or mismatched dual diameters. Always measure tread circumference when pairing duals.
• Curb damage and sidewall scuffing from tight urban routes; choose reinforced shoulder ribs and maintain proper pressure.
• Feathering/cupping on steer axle due to worn shocks or toe settings; perform regular alignments, especially after body/upfit changes.
• Valve extension leaks on duals; use quality braided extensions with proper support brackets and replace aged rubber valves.
• Rapid shoulder wear on steers from constant low‑speed turning and heavy front axle loads; rotate on a strict interval and monitor inflation.
• Overloading beyond GAWR/GVWR causing excessive heat and belt separations; weigh the vehicle in service trim.

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