2020 Peterbilt 579 Tire Specs
AI-generated reference. Always verify torque values, fluid capacities, intervals, and procedures against the manufacturer's service manual or OEM repair information before performing work. Repairius is not liable for damage from acting on this content without verification.
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Quick Answer
- OEM Tire Size: 295/75R22.5 (standard)
- Recommended Cold Tire Pressure (door placard): 110 psi (front), 85 psi (rear)
- Bolt Pattern: 10x285.75 mm
- Wheel Size: 22.5" x 8.25"
- Load Index/Speed Rating: 144/141L
- Spare Tire Size: Full-size spare recommended
- TPMS Frequency: Not applicable (most Class 8 trucks use hub-mounted sensors or valve stem-mounted sensors that are not TPMS)
Tire Sizes by Trim
| Trim | Standard Size | Optional Upgrades |
|---|---|---|
| All | 295/75R22.5 | 11R22.5, 275/80R22.5 |
Recommended Replacement Tires
Here are some popular replacement tire options for the 2020 Peterbilt 579:
- $$$: Michelin X-Line Energy Z (long-haul, fuel-efficient)
- $$: Bridgestone R283A Ecopia (steer/all-position)
- $: Goodyear Endurance RSA (regional/all-position)
When to Inflate to Max Load PSI
As a heavy-duty truck, the 2020 Peterbilt 579 is often operated at or near its maximum gross vehicle weight rating (GVWR). In these situations, it is critical to inflate the tires to the maximum cold pressure indicated on the tire sidewall. This ensures the tires can support the load and prevents dangerous overheating.
Lug Nut Torque & Pattern
- Torque: 450–500 ft-lbs
- Pattern: Star/crisscross pattern
Common Tire Issues for This Vehicle
- Irregular wear: Due to the high mileage and heavy loads, the 2020 Peterbilt 579 can be prone to irregular tire wear. Regular alignments and tire rotations are critical to maximizing tire life.
- Underinflation: In a fleet setting, it can be challenging to maintain proper tire inflation. Underinflated tires can lead to decreased fuel economy, premature wear, and blowouts.
Need new tires? Find a trusted shop on Repairius.
More specs for the 2020 Peterbilt 579
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Fuse Box Diagram & Amperage
Fuse box locations, layout, amps, and what each fuse controls.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
Maintenance & repair guides
2020 Peterbilt 579 Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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