2020 Ford F-350 Super Duty: Tire Size & Pressure Guide

Quick Answer: 2020 Ford F-350 Tire & Wheel Specs

• OEM Tire Sizes: LT245/75R17E, LT275/65R18E, LT275/70R18E, LT275/65R20E
• Recommended Cold Tire Pressure (Placard): Front: 60–75 psi | Rear: 60–80 psi (varies by engine, cab, and bed configuration—always check your door jamb sticker)
• Bolt Pattern: 8x170mm (SRW - Single Rear Wheel) | 8x200mm (DRW - Dual Rear Wheel)
• Wheel Size: 17x7.5", 18x8", 20x8" (SRW) | 17x6.5" (DRW)
• Load Index / Speed Rating: Typically 121/118S up to 126/123S (Load Range E)
• Spare Tire Size: Full-size spare, typically matching the base model tire (e.g., LT275/65R18E on an 18" steel wheel).
• TPMS Frequency: 315 MHz

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2020 Ford F-350 Tire Sizes by Trim

Ford offered a variety of wheel and tire combinations for the 2020 F-350, largely dependent on the trim level and whether the truck was a Single Rear Wheel (SRW) or Dual Rear Wheel (DRW) configuration.

Trim	Standard Tire Size	Optional Tire Size(s)
XL	LT245/75R17E (DRW) or LT275/65R18E (SRW)	LT275/70R18E (All-Terrain)
XLT	LT275/65R18E	LT275/70R18E (All-Terrain), LT275/65R20E
Lariat	LT275/65R18E	LT275/70R18E (All-Terrain), LT275/65R20E
King Ranch	LT275/65R20E	LT275/70R18E (All-Terrain, No-Cost Option)
Platinum	LT275/65R20E	LT275/70R18E (All-Terrain, No-Cost Option)
Limited	LT275/65R20E	N/A

Note: Models equipped with the Tremor Off-Road Package came standard with LT285/75R18E all-terrain tires on unique 18-inch wheels.

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Recommended Replacement Tires

Replacing the tires on your F-350 is a critical investment in its performance and safety. Your choice should reflect your typical usage, whether that's highway cruising, towing heavy loads, or venturing off-road.

• Premium Highway/All-Season (Good for Towing): Michelin Defender LTX M/S. A top-tier option known for its long tread life, quiet ride, and excellent wet-weather traction. Its robust construction handles the high tongue weights and payloads associated with Super Duty trucks.
• Premium All-Terrain: BFGoodrich All-Terrain T/A KO2. A legendary, aggressive all-terrain tire that provides outstanding off-road grip without a huge sacrifice in on-road comfort. Its tough sidewalls are a major plus for preventing punctures on trails or construction sites.
• Mid-Range All-Terrain: Cooper Discoverer AT3 XLT. This tire is a fantastic value, offering a compelling blend of on-road manners and off-road capability. It's specifically designed for heavy-duty trucks, featuring durable construction for towing and hauling with an aggressive look.
• Budget All-Terrain: General Grabber A/TX. For the owner who needs a capable all-terrain tire without the premium price tag. The A/TX delivers reliable traction in dirt, gravel, and snow and is surprisingly quiet on the highway.

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When to Inflate to Max Load PSI

A common point of confusion for heavy-duty truck owners is tire pressure. The pressure listed on your driver's side door jamb (e.g., 65 psi Front / 75 psi Rear) is the recommended cold inflation pressure for normal, unloaded driving. It provides the best balance of ride comfort, handling, and tire wear under light-load conditions.

However, when you are towing a heavy fifth-wheel, gooseneck, or conventional trailer, or when you have a significant load in the bed (like a pallet of materials or a slide-in camper), you must increase your rear tire pressure. Inflate the tires to the maximum cold pressure indicated on the tire's sidewall. For most Load Range E tires on the F-350, this is 80 psi.

Running max PSI under load prevents excessive sidewall flex, reduces heat buildup, and provides the stability needed to manage the weight safely. Failure to do so can lead to premature tire wear, poor handling, and an increased risk of a blowout.

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Lug Nut Torque & Pattern

Properly torquing your wheels is a critical safety step when rotating tires or after any wheel service. Using the correct pattern ensures the wheel is seated flat against the hub.

• Lug Nut Torque Spec: 165 lb-ft (224 Nm)
• Lug Pattern: Use a star or criss-cross pattern to ensure even clamping force. For an 8-lug wheel, tighten the nuts in the following sequence: 1-5-3-7-2-6-4-8. Always verify that all lug nuts are tightened to the final torque spec.

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Common Tire Issues for the 2020 Ford F-350

• Premature Wear from Towing: The immense torque and weight associated with the F-350, especially diesel models, can wear out rear tires quickly if pressures aren't correct or if you have a heavy foot. Regular rotations (every 5,000 miles) are essential.
• "Death Wobble" Trigger: While caused by worn suspension or steering components (track bar, ball joints, steering damper), an out-of-balance tire or a tire with irregular wear can often be the trigger for this violent front-end vibration. If you experience it, a professional tire and suspension inspection is required immediately.
• Cupping and Edge Wear: Super Duty trucks are heavy, and their front-end components work hard. Worn shocks, ball joints, or improper alignment can cause the tires to develop a "cupped" or scalloped wear pattern, leading to noise and vibration. Consistent alignment checks are a must.

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