2018 Ford Trucks F-350 Super Duty Tires

The 2018 Ford Trucks F-350 Super Duty uses five primary tire sizes: 245/75R17, 265/70R17, 275/65R18, 275/70R18, and 275/65R20. All of them are radial fitments, but the correct size depends on the exact trim, drivetrain, wheel package, and whether the truck is single rear wheel or dual rear wheel.

The practical first step is checking the tire size currently on the truck and confirming the wheel diameter. Several F-350 configurations share the same model name while using different rims and tire profiles, so choosing by year and model alone is not enough on this truck.

A 2018 Ford Trucks F-350 Super Duty can use 17-inch, 18-inch, or 20-inch rims, depending on the specific sub-model and tire package. The 245/75R17 and 265/70R17 sizes use 17-inch rims, 275/65R18 and 275/70R18 use 18-inch rims, and 275/65R20 uses a 20-inch rim.

Rim diameter is the most important fitment checkpoint because it immediately narrows the correct tire size group. After that, it helps to confirm the truck’s exact trim and whether it is DRW, since a dual-rear-wheel F-350 follows a different fitment path than many single-rear-wheel versions.

This F-350 Super Duty uses more than one tire size because the model range includes different trims, 4x2 and 4x4 layouts, single-rear-wheel and dual-rear-wheel versions, and snow-plow-related configurations. Those combinations lead to five separate primary radial sizes across 17-inch, 18-inch, and 20-inch wheels.

That means tire selection starts with the exact truck configuration, not just the badge on the fender. A King Ranch, XL, or XLT may share the same model family while using different wheel diameters or profiles, so checking the existing wheel and size marking prevents an avoidable mismatch.

Start with the correct primary tire size for the exact sub-model, then compare wheel diameter, load capacity, and rim-width specification. On the 2018 Ford Trucks F-350 Super Duty, those details matter because fitments range from 17-inch to 20-inch wheels and include both single-rear-wheel and dual-rear-wheel applications.

The available product line also gives some selection detail within the correct size, including sidewall style, tire weight, and service rating differences. A truck used for towing, hauling, or snow-plow-related work should be matched carefully to the proper tire specification rather than treated like a light-duty pickup fitment.

Sidewall choices for the 2018 Ford Trucks F-350 Super Duty include RWL and RBL, depending on the size. Most of the available BFGoodrich All-Terrain T/A KO2 fitments use an RWL sidewall, while the 275/65R20 option uses an RBL sidewall treatment.

That difference mainly affects appearance, so it comes into play after the correct tire size and wheel diameter have been confirmed. On a heavy-duty truck like the F-350, the sidewall style should be treated as a secondary decision behind correct fitment, load capacity, and compatibility with the truck’s existing wheels.

The 265/70R17 size for the 2018 Ford Trucks F-350 Super Duty is available in more than one BFGoodrich All-Terrain T/A KO2 specification. Both share the same size, series, and RWL sidewall style, but they differ in service specification, including maximum load figures of 2,470 lbs @ 50 psi and 3,195 lbs @ 80 psi.

That makes this a specification choice rather than an appearance choice. Matching the tire to the truck’s intended use, wheel compatibility, and required service range is more important than simply selecting any 265/70R17, especially on a heavy-duty platform where working load can vary significantly.

Correct tire fitment still matters on a 2018 Ford Trucks F-350 Super Duty, even though this is a modern heavy-duty truck rather than a vintage restoration vehicle. The right size preserves the truck’s intended wheel relationship and helps keep the appearance consistent with the trim and wheel package it actually carries.

For a restoration-minded or collector-kept truck, the goal is usually to stay faithful to the proper size group rather than substitute a different diameter or profile for convenience. Verifying the original wheel package on the truck is especially important because this model range spans several sizes and three rim diameters.

A period-style appearance on a 2018 Ford Trucks F-350 Super Duty usually starts with keeping the tire size and wheel diameter appropriate to the truck’s actual trim and configuration. Within the available options, most sizes use an RWL sidewall, while 275/65R20 uses an RBL treatment, so the correct look depends partly on which wheel package belongs on the truck.

Appearance should follow fitment, not override it. Choosing a sidewall style that matches the truck’s existing wheel setup generally creates a more coherent result than forcing a different size just to get a certain look, especially on a late-model heavy-duty truck with trim-specific tire packages.

Yes, modifications can affect tire fitment on a 2018 Ford Trucks F-350 Super Duty. Aftermarket wheels, leveling kits, suspension changes, or alterations to ride height can all change how a 17-inch, 18-inch, or 20-inch tire sits in the wheel opening and how it clears suspension and steering components.

That matters even more on an F-350 because the truck already uses several factory tire sizes across different configurations. Any modified truck should be checked for wheel diameter, rim width, clearance at full steering lock, and sufficient room under load before a replacement tire is selected.

Before driving a 2018 Ford Trucks F-350 Super Duty on new tires, inspect wheel condition, confirm the tire size matches the truck’s actual configuration, and verify inflation is set appropriately for the tire specification. It also helps to recheck lug torque, valve condition, and any obvious interference around the wheel opening.

A short initial road test is useful for spotting rubbing, vibration, or steering issues that may not appear while the truck is parked. On a heavy-duty pickup, those checks are especially important if the truck tows, hauls, uses a snow plow package, or has seen prior wheel or suspension changes.

Tires on a 2018 Ford Trucks F-350 Super Duty should be inspected regularly, with a quick visual check before routine driving and a more careful inspection at service intervals or before towing and hauling. Look for uneven wear, air loss, cuts, bulges, tread damage, and signs that the tire is not wearing evenly across the contact patch.

A truck in work use deserves closer attention than a lightly driven vehicle because load, road conditions, and steering stress can accelerate wear. Checking pressure and condition consistently is especially important when similar-looking F-350 tires carry different load capacities within the same general size family.