2021 Ford F-350 Super Duty Tire Size & Pressure Guide
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Quick answer
- OEM Tire Size: 275/65R18, 275/70R18, 275/65R20, 295/65R20
- Recommended Cold Tire Pressure (Door Placard): Varies by specific tire and GAWR, typically:
- Front: 60-80 psi
- Rear: 60-80 psi
- (Always refer to your vehicle's door jamb placard)
- Bolt Pattern: 8x170mm
- Wheel Size: 18x8.0", 20x8.0"
- Load Index/Speed Rating: Varies by tire size and ply rating, commonly E (10-ply) or F (12-ply) with speed ratings from R to S.
- Spare Tire Size: Matches one of the OEM tire sizes.
- TPMS Frequency: 315 MHz
Tire sizes by trim
The 2021 Ford F-350 Super Duty was available with several tire and wheel combinations depending on the trim level and optional packages.
| Trim/Package | Tire Size | Wheel Size |
|---|---|---|
| XL, XLT (Standard) | 275/65R18 | 18x8.0" |
| Lariat, King Ranch, Platinum (Standard/Optional) | 275/70R18 | 18x8.0" |
| Lariat, King Ranch, Platinum (Optional) | 275/65R20 | 20x8.0" |
| Tremor Off-Road Package | 295/65R20 | 20x8.0" |
Note: Wheel offset typically ranges from +40mm to +60mm depending on factory wheel design. Always confirm your specific vehicle's specifications.
Recommended replacement tires
HGTRUCKS LIKE THE F-350 SUPER DUTY REQUIRE TIRES THAT CAN HANDLE HEAVY LOADS WHILE PROVIDING GOOD TRACTION AND DURABILITY. HERE ARE A FEW POPULAR OPTIONS THAT ARE WELL-SUITED FOR THE 2021 F-350:
- BFGoodrich All-Terrain T/A KO2 (Premium): A highly regarded all-terrain tire known for its exceptional off-road traction, durability, and decent on-road manners. Expect to pay $300-$400+ per tire, depending on size.
- Michelin Defender LTX M/S (Premium): An excellent highway all-season tire offering a smooth, quiet ride, long tread life, and great wet-weather performance. Priced similarly to the KO2s, around $280-$380+ per tire.
- Goodyear Wrangler Duratrac (Mid-Premium): A more aggressive all-terrain option than the Defender, offering superior traction in mud and snow while still performing well on pavement. Typically costs $270-$370+ per tire.
- Toyo Open Country A/T III (Mid-Range): A good value all-terrain tire with a balance of off-road capability and on-road comfort. Generally available for $250-$350+ per tire.
When to inflate to max load psi
For heavy-duty trucks like the Ford F-350 Super Duty, understanding tire pressure is crucial, especially when hauling or towing. The recommended cold tire pressures found on your door placard are set to optimize ride, handling, and tire wear for typical driving conditions and Gross Axle Weight Ratings (GAWR).
However, when your F-350 is loaded close to its maximum Gross Vehicle Weight Rating (GVWR) or Gross Combined Weight Rating (GCWR), or when you
More specs for the 2021 Ford F-350 Super Duty
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
2000 F-350 Super Duty
2001 F-350 Super Duty
2002 F-350 Super Duty
2003 F-350 Super Duty
2004 F-350 Super Duty
2005 F-350 Super Duty
Maintenance & repair guides
2021 Ford F-350 Super Duty 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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Values can vary by engine, trim and build date; check your VIN-specific service information. Updated 2026-06-22.