2015 Kenworth W900: Tire Size & Pressure Guide
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Quick Answer
- OEM Tire Size: Varies significantly based on configuration and axle. Common sizes include 11R22.5 and 11R24.5 for drive and steer axles. Some heavy-haul applications may use larger flotation tires.
- Recommended Cold Tire Pressure: Refer to your specific vehicle's door placard or tire manufacturer guidelines. Pressures can range from 90-120 PSI, depending on tire size, load, and axle position.
- Bolt Pattern: Typically 10-hole, 285.75mm (11.25 inches) bolt circle diameter for most heavy-duty trucks.
- Wheel Size: Primarily 22.5-inch and 24.5-inch diameter steel or aluminum wheels, with various widths (e.g., 8.25 inches).
- Load Index/Speed Rating: Varies by tire size and application. Commercial truck tires generally have high load indexes (e.g., 146/143L for 11R22.5) and speed ratings (often L for 75 mph or M for 81 mph).
- Spare Tire Size: Often the same as the primary drive or steer tires, but many operators do not carry a mounted spare, opting for roadside tire service.
- TPMS Frequency: Not typically standard on older heavy-duty trucks like the 2015 W900, as regulations for TPMS on commercial vehicles vary and were not as widespread for line-haul trucks at this time. If equipped, it would likely be 433 MHz.
Tire Sizes by Axle and Application
Unlike passenger vehicles, the Kenworth W900, a heavy-duty Class 8 truck, has a wide array of tire configurations due to its highly customizable nature and diverse applications (e.g., line haul, heavy haul, vocational). Tire sizes are selected based on gross vehicle weight rating (GVWR), gross combination weight rating (GCWR), axle ratings, and intended use.
| Axle Position | Common Tire Sizes (Examples) | Application Notes |
|---|---|---|
| Steer Axle | 11R22.5, 315/80R22.5, 295/75R22.5 | Standard on-highway use. 315/80R22.5 offers higher load capacity and flotation. |
| Drive Axle | 11R22.5, 295/75R22.5, 11R24.5 | Most common sizes for traction and load. 24.5-inch wheels offer slightly better fuel economy at sustained highway speeds due to larger circumference. |
| Heavy Haul/Vocational (Steer) | 425/65R22.5, 445/65R22.5 | "Super single" or flotation tires for increased weight distribution and off-road capability. |
| Heavy Haul/Vocational (Drive) | 12R24.5, 315/80R22.5 (duals) | Larger sizes or aggressive treads for severe service and maximum load. |
Recommended Replacement Tires
When replacing tires on a 2015 Kenworth W900, it's crucial to match the original equipment specifications or upgrade to tires that meet or exceed the vehicle's requirements for load, speed, and intended use. Popular brands known for durability and performance in heavy-duty trucking include Michelin, Goodyear, Bridgestone, and Continental.
- Michelin X Line Energy Z/D (Steer/Drive): A premium long-haul tire designed for fuel efficiency and extended tread life. Excellent for line-haul applications. Price Tier: Premium
- Goodyear G399 LHS / G305 LHD (Steer/Drive): A robust combination for line-haul and regional applications, offering good mileage and traction. Price Tier: Premium
- Bridgestone M775 / M720 (Steer/Drive): Workhorse tires known for durability and retreadability, suitable for mixed service and regional hauling. Price Tier: Mid-Premium
- Continental Conti Hybrid HS3 / HD3 (Steer/Drive): Designed for regional and line-haul applications, balancing fuel efficiency and mileage. Price Tier: Mid-Premium
- Firestone FS507 / FD690 (Steer/Drive): A more budget-friendly option offering reliable performance for general use. Price Tier: Value
When to Inflate to Max Load PSI
For heavy-duty trucks like the Kenworth W900, "max load PSI" refers to the tire
More specs for the 2015 Kenworth W900
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
2015 Kenworth W900 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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