2020 Isuzu NPR — Tire Size, Pressure, Bolt Pattern & Wheel Specs

Quick answer

• OEM tire size: 215/85R16 (most 2020 NPR/NPR‑HD); some fleets use 225/75R16. All are commercial LT tires rated for dual‑rear (DRW) use.
• Recommended cold tire pressure (door placard): typically 65–80 psi front; 80 psi rear (dual wheels). Exact values vary by GVWR/tire—follow your door placard.
• Bolt pattern: 6×205 mm (hub‑centric, medium‑duty pattern).
• Wheel size and offset: 16×6.0 to 16×6.5 inches; deep positive offset typically +120 to +135 mm (verify wheel stamp/casting).
• Load index / speed rating: commonly 115/112 to 123/120 (single/dual); speed rating Q–R on commercial LT tires.
• Spare tire size: full‑size 16" matching the road tires if equipped; many NPRs were delivered without a spare from the factory or upfitter.
• TPMS frequency: not universally equipped on NPR in this model year. If fitted, many sensors use 433 MHz; some aftermarket kits are 315 MHz—confirm with a scan tool or the sensor supplier.

Tire sizes by trim

Notes:

• Always match or exceed the load index shown on your door placard, especially for dual‑rear applications (look for dual rating like 115/112).
• Some regional or upfitted NPRs may list alternative commercial sizes; verify against the truck’s placard and axle ratings.

Recommended replacement tires

• Premium: Michelin Agilis CrossClimate (LT215/85R16 E or LT225/75R16 E). Excellent wet/snow braking with commercial casing; good for high‑mileage fleets. Typical street price: $230–$300 per tire.
• Workhorse commercial rib: Toyo M154 or Yokohama Y356 (LT215/85R16 E). All‑position rib patterns that run cool on duals and resist irregular wear. ~$190–$260.
• Heavy‑duty all‑terrain/commercial: Bridgestone Duravis M700 HD (LT215/85R16 E) or Duravis R238 (select sizes). Durable tread blocks and strong belts for jobsite use. ~$200–$270.
• Value fleet favorite: Firestone Transforce HT2 or AT2 (LT215/85R16 E / LT225/75R16 E). Widely available, predictable wear, budget‑friendly. ~$160–$220.
• Balanced value: Hankook Dynapro HT RH12 (LT215/85R16 E). Good ride with stout load ratings. ~$170–$220.

Tip: For dual rears, choose tires explicitly marked for dual application and keep all six the same size/model for even wear and proper dual spacing.

When to inflate to max load psi (HD trucks)

• Use the door‑placard pressures for normal mixed driving—they’re engineered for ride, handling, and typical payloads.
• Inflate to the tire’s sidewall “Max Load @ Max PSI” only when you are operating near axle GAWR or the tire’s rated capacity (heavy payloads, frequent max‑weight hauling). For most LT Load Range E tires that’s 80 psi; some Load Range F options list up to 95 psi.
• For dual rears, run both tires on the axle at the same pressure. Weigh the truck (scale per axle) after upfit to confirm the correct pressure using the tire maker’s load‑inflation tables.

Lug nut torque & pattern

• Lug pattern: 6‑lug, 6×205 mm hub‑centric. Use a star/alternating pattern in multiple steps.
• Torque: typically 160–220 ft‑lb for 16" 6‑lug NPR wheels. Always confirm the exact spec for your wheel/stud combination in the Isuzu service manual or the wheel manufacturer’s documentation. Re‑torque after 50–100 miles on newly installed wheels.

Common tire issues for this vehicle

• Inner‑dual air loss: Valve stems and extensions on DRW wheels are common leak points. Use metal stems rated for the intended pressure and protective stabilizers.
• Irregular steer wear (river wear/feathering): Cab‑over geometry plus tight urban routes can cause edge wear. Maintain front‑end alignment and rotate on a 6,000–8,000‑mile interval.
• Dual mismatch/overheating: Mixing brands/tread depths on a dual set leads to diameter mismatch, heat build‑up, and premature wear. Keep duals matched within 2/32" tread and the same model.
• Cupping from worn shocks: Heavily laden stop‑and‑go service accelerates shock wear; replace weak dampers to prevent cupping.
• Sidewall cracking/aging: Low‑mileage municipal or parcel trucks often age out before they wear out. Inspect for ozone/UV cracking and replace by 6–7 years regardless of tread depth.

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