2015 Isuzu NPR — Tire Size, Pressure & Wheel Specs

Quick answer

• OEM tire size(s):
  • NPR/NPR Eco-Max (≈12,000 lb GVWR): LT215/85R16 Load Range E (dual rear wheels)
  • NPR-HD (≈14,500 lb GVWR): 225/70R19.5 Load Range G (dual rear wheels)
• Recommended cold tire pressure (door placard, typical ranges):
  • LT215/85R16E: Front 60–75 psi; Rear dual 75–80 psi
  • 225/70R19.5G: Front 85–100 psi; Rear dual 95–110 psi (Always follow your specific door placard and load charts.)
• Bolt pattern: 6x205 mm hub-centric (NPR/NPR-HD)
• Wheel size:
  • 16x6.0 (NPR/Eco-Max)
  • 19.5x6.0 (NPR-HD)
  • Offset: high positive; typically +80 to +130 mm depending on wheel; verify stamping/spec
• Typical load index/speed rating:
  • LT215/85R16E: 115/112 R (single/dual)
  • 225/70R19.5G: 128/126 N to 129/127 N (single/dual)
• Spare tire size: Full-size matching (LT215/85R16E or 225/70R19.5G to match your trim)
• TPMS sensor frequency: Not factory-equipped on most 2015 NPR in the U.S. (vehicle >10k GVWR). Aftermarket TPMS varies (commonly 433 MHz or 315 MHz)—verify your system.

Tire sizes by trim

Note: Actual placard pressures and service descriptions can vary by body, wheelbase, and axle GAWR. Always confirm on your door sticker and tire sidewalls.

Recommended replacement tires

Below are popular, proven choices that fit the NPR’s common sizes. Pricing varies by market and casing/warranty policies.

LT215/85R16 Load Range E (NPR/Eco‑Max)

• Premium: Michelin Defender LTX M/S — Long tread life and wet traction for mixed urban/highway service.
• Mid-range: Firestone Transforce HT2 — Durable commercial all-season rib; good for delivery routes.
• Value: Cooper Discoverer HT3 — Solid highway rib pattern with even-wear design for DRW fitments.

225/70R19.5 Load Range G (NPR‑HD)

• Premium: Bridgestone R238 (All-Position) — Robust shoulders and scrub-resistant compound for urban stop‑and‑go.
• Mid-range: Toyo M154 (All-Position) — Popular N‑series fitment; stable casing and even wear on DRW.
• Value: Sailun S637 (All-Position) — Fleet-favorite budget option with good heat resistance.

Tip: On dual rear wheels, always replace in pairs on the same axle side and match diameters/tread depths to avoid overload on one tire.

When to inflate to max load psi (HD trucks)

• LT215/85R16E tires reach rated capacity at 80 psi cold; 225/70R19.5G at 110 psi cold. Inflate to these “max load” pressures only when axle loads are at or near GAWR or when your body/upfit and cargo push the truck toward GVWR.
• If you routinely run partially loaded, use the door placard pressures or a tire manufacturer’s load/inflation table for your exact axle weights. Overinflating an unloaded truck can reduce ride quality and traction and promote center wear.

Lug nut torque & pattern

• Stud/lug pattern: 6-lug hub-centric.
• Typical torque range: 200–300 lb‑ft for N‑Series 6‑lug steel wheels. Refer to the Isuzu service manual or wheel supplier spec for your exact wheel and stud size.
• Tightening sequence: Use a star/crisscross pattern for 6‑lug wheels. Always torque in stages (e.g., 1/3, 2/3, final), then re‑torque after 50–100 miles, especially after wheel or tire service.

Common tire issues for this vehicle

• Inner dual wear/heat: Often caused by underinflation or mismatched dual diameters. Use accurate gauges and keep pairs closely matched.
• Shoulder scrub and feathering on steer tires: Common in urban routes with frequent tight turns and curb contacts; maintain alignment and rotate on schedule.
• Cupping or river wear on steers: Inspect kingpins, tie rods, and shocks; correct toe and balance.
• Valve/extension leaks on duals: Check metal valve stems and extensions regularly; replace grommets and caps as needed.
• Curb/rim damage: The cab‑over layout invites tight maneuvers—train drivers and consider protective rub rails on bodies.

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