2025 Peterbilt 579 — Tire Size & Pressure
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: Varies by configuration, common steer: 295/75R22.5, drive: 295/75R22.5 or 11R22.5
- Recommended Cold Tire Pressure (Door Placard): Varies significantly by load and axle. Always refer to the specific vehicle's door placard or tire pressure sticker.
- Bolt Pattern: Typically 10-hole, 285.75mm bolt circle (11.25 inches) for hub-piloted wheels.
- Wheel Size: 22.5 x 8.25 inches or 24.5 x 8.25 inches, depending on configuration.
- Load Index/Speed Rating: Varies greatly by tire type and application. Common steer tires may have a load index of 144/141 (single/dual) and speed rating L (75 mph). Drive tires similar.
- Spare Tire Size: A full-size spare is uncommon for most commercial trucks. Fleets often carry a spare wheel and tire assembly or rely on roadside assistance/tire service.
- TPMS Frequency: Typically 433 MHz for commercial heavy-duty trucks.
Tire sizes by trim
The Peterbilt 579 is a highly customizable heavy-duty truck, and tire sizes can vary significantly based on the specific configuration, application (e.g., long-haul, vocational, regional), axle specifications, and customer preference. There isn't a simple "trim" level like passenger vehicles.
Here are common tire sizes you might find:
| Axle | Common Tire Size |
|---|---|
| Steer | 295/75R22.5 |
| Steer | 11R22.5 |
| Steer | 385/65R22.5 |
| Drive | 295/75R22.5 |
| Drive | 11R22.5 |
| Drive | 285/75R24.5 |
| Drive | 11R24.5 |
Always verify the exact tire size on your truck's tire sidewall and compare it to the vehicle's specifications.
Recommended replacement tires
When replacing tires on a 2025 Peterbilt 579, it's crucial to select tires that meet or exceed the original equipment specifications for load capacity, speed rating, and intended use. Commercial truck tires are designed for specific positions (steer, drive, trailer).
Premium Tier (High Performance & Longevity):
- Michelin X Line Energy Z (Steer) / D (Drive): Known for excellent fuel efficiency, long tread life, and strong retreadability. Prices typically range from $600-$900+ per tire, depending on size and dealer.
- Goodyear Fuel Max S (Steer) / D (Drive): Offers competitive fuel economy and durability, designed for long-haul applications. Expect prices in the $550-$850+ range.
Mid-Tier (Good Balance of Performance & Cost):
- Bridgestone R283A Ecopia (Steer) / M760 Ecopia (Drive): A popular choice for regional and long-haul, offering good mileage and respectable fuel efficiency. Prices generally fall between $450-$750+.
- Continental Conti Hybrid HS3 (Steer) / HD3 (Drive): Designed for a blend of regional and long-haul use, providing good all-around performance and durability. Prices typically run $400-$700+.
Value Tier (Cost-Effective & Reliable):
- Double Coin RT606 (Steer) / RT500 (Drive): A solid choice for fleets looking for an economical option that still provides reliable performance and good retreadability. Prices commonly range from $300-$550+.
Note: Tire prices are estimates and can vary significantly based on retailer, promotions, location, and specific tire size/features.
When to inflate to max load psi
For heavy-duty trucks like the Peterbilt 579, "max load PSI" is a critical concept, but it
More specs for the 2025 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
2025 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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