2018 Ford F-350 Super Duty: Tire Size & Pressure Specs

Quick Answer

• OEM Tire Size: 245/75R17, 275/70R18, 275/65R20
• Recommended Cold Tire Pressure (Door Placard): Varies by specific tire and load. Refer to your vehicle's door placard.
• Bolt Pattern: 8x170mm
• Wheel Size: 17x8", 18x8", 20x8"
• Load Index/Speed Rating: Varies significantly by tire size and type, commonly E (10-ply rated). Consult specific tire for rating.
• Spare Tire Size: Matches OEM tire size
• TPMS Frequency: 315 MHz

Tire Sizes by Trim

Recommended Replacement Tires

The 2018 Ford F-350 Super Duty demands robust tires capable of handling heavy loads and various driving conditions. Here are a few popular and highly-rated replacement options:

• BFGoodrich All-Terrain T/A KO2: (Premium Tier) An excellent all-around tire known for its durability, off-road traction, and respectable on-road manners. Great for trucks that see a mix of highway and job site use.
• Michelin Defender LTX M/S: (Premium Tier) A top choice for highway comfort, long tread life, and all-season traction. Ideal for F-350 owners who prioritize a smooth, quiet ride and strong performance in wet and light snow conditions.
• Goodyear Wrangler Duratrac: (Mid-Premium Tier) Offers aggressive off-road traction similar to a mud-terrain tire but with significantly better on-road performance. A good compromise for those needing serious grip without the harshness of a dedicated mud tire.
• Falken Wildpeak A/T3W: (Mid-Tier) A popular choice offering a balance of aggressive all-terrain performance and a comfortable ride at a competitive price point. It performs well in various conditions, including snow.

When to Inflate to Max Load PSI

For a heavy-duty truck like the 2018 Ford F-350 Super Duty, understanding tire pressure, especially when carrying heavy loads, is critical for safety and tire longevity. The recommended cold tire pressure found on your door placard is typically for the maximum Gross Vehicle Weight Rating (GVWR) or Gross Axle Weight Rating (GAWR) for your specific vehicle configuration.

However, if you are consistently towing or hauling near the maximum capacity of your F-350, you should always inflate your tires to the maximum PSI indicated on the tire's sidewall (often referred to as max load PSI or max cold inflation pressure). This ensures the tires can safely support the increased weight, prevents excessive sidewall flexing (which generates heat and can lead to premature tire failure), and maintains proper handling and stability. Never exceed the maximum pressure listed on the tire's sidewall.

When unloaded, you can often reduce the tire pressure slightly from the maximum specified on the tire's sidewall to the door placard recommendations for a more comfortable ride, improved fuel economy, and better tire wear. However, always re-inflate to maximum PSI when preparing for heavy loads.

Lug Nut Torque & Pattern

The 2018 Ford F-350 Super Duty uses an 8-lug bolt pattern. Proper lug nut torque is essential to ensure the wheels are securely fastened and to prevent issues like wheel stud stretching or rotor warpage.

• Lug Nut Torque: 165 lb-ft (225 Nm)
• Bolt Pattern: 8x170mm

Always tighten lug nuts in a star or crisscross pattern to ensure even seating of the wheel against the hub. After driving approximately 50-100 miles after a wheel removal or tire rotation, it's a good practice to re-torque the lug nuts to ensure they remain properly seated.

Common Tire Issues for This Vehicle

Owners of 2018 Ford F-350 Super Duty trucks commonly report a few tire-related concerns:

• Rapid or Uneven Tread Wear: Due to the heavy nature of these trucks, even slight alignment issues or improper tire pressure can lead to accelerated and uneven tire wear. Regular alignments (especially after lifting or leveling), proper inflation, and routine tire rotations are crucial.
• "Death Wobble": While not strictly a tire issue, worn tires can exacerbate the intermittent and violent shaking of the front end known as "death wobble." This is usually tied to worn steering components (track bar, tie rods, ball joints), but tires with irregular wear or out of balance can contribute to the sensation.
• Cupping/Scalloping: This wavy wear pattern on the tire tread is often indicative of worn shock absorbers, unbalanced tires, or problems with the suspension system. It can lead to increased road noise and reduced tire life.
• TPMS Sensor Malfunctions: Like many modern vehicles, TPMS sensors can occasionally fail due to battery depletion or physical damage. Ensuring new sensors are properly programmed (315 MHz) when replacing tires or wheels is important.

Need new tires? Find a trusted shop on Repairius.