2021 Ford Trucks F-350 Super Duty Tires

The 2021 Ford Trucks F-350 Super Duty uses six primary radial tire sizes: 275/65R18, 275/65R20, 245/75R17, 275/70R18, 285/75R18, and 265/70R17. The correct size depends on the exact trim, whether the truck is 4x2 or 4x4, whether it is dual rear wheel, and whether it carries the Tremor Off-Road Package.

The quickest way to narrow fitment is to confirm the truck’s sub-model and current wheel diameter before looking at product choices. A DRW truck, a Tremor truck, and a standard single-rear-wheel truck can all fall under the same F-350 Super Duty model name while using different tire sizes.

The 2021 Ford Trucks F-350 Super Duty uses 17-inch, 18-inch, and 20-inch rim diameters depending on configuration. The 245/75R17 and 265/70R17 sizes use 17-inch rims, the 275/65R18, 275/70R18, and 285/75R18 sizes use 18-inch rims, and the 275/65R20 size uses a 20-inch rim.

Rim diameter is the first fitment check because the truck does not use one wheel size across the entire lineup. Once the wheel diameter is confirmed, the next step is matching the exact tire size already tied to the truck’s trim, axle layout, and package combination.

The 2021 Ford Trucks F-350 Super Duty has more than one tire size because the model range includes different trims, single-rear-wheel and dual-rear-wheel setups, 4x2 and 4x4 layouts, and Tremor Off-Road Package applications. Those variations bring different wheel diameters and tire dimensions across the lineup.

That matters because one F-350 badge does not point to one universal replacement size. A truck with 20-inch wheels, a DRW rear axle, or Tremor equipment should be matched to its exact setup, not to another F-350 sub-model that happens to share the same model year.

Start with the correct primary tire size for the exact truck, then compare wheel diameter, construction, load specification, and rim-width requirements. On the 2021 Ford Trucks F-350 Super Duty, that process matters because sizes range from 17-inch DRW fitments to 20-inch single-rear-wheel applications and the larger 285/75R18 Tremor setup.

After size is confirmed, think about how the truck is actually used. A work-focused truck, a lightly driven personal truck, and an off-road-oriented Tremor setup may all point to different priorities, even before comparing details like sidewall style, load capacity, and the exact rim-width range tied to the tire.

Available sidewall styles for the covered 2021 Ford Trucks F-350 Super Duty tires include RWL and RBL. The BFGoodrich All-Terrain T/A KO2 options in 275/65R18, 245/75R17, 275/70R18, and 265/70R17 use RWL, while the 275/65R20 option uses RBL.

Sidewall style is mostly an appearance decision once the correct size and wheel fitment are settled. It still helps to verify it before purchase, especially on a truck where wheel diameter and trim level can shift the available tire presentation even within the same overall model family.

The product range shown here centers on the BFGoodrich All-Terrain T/A KO2 series across several F-350 Super Duty sizes. That means the main comparison within the available assortment is less about switching between series and more about matching the right KO2 size, rim-width range, load specification, and sidewall style to the truck.

This is useful because even one tire series can vary in meaningful ways from size to size. A 17-inch DRW fitment, an 18-inch single-rear-wheel setup, and a 20-inch application should still be compared by wheel compatibility and service needs rather than by series name alone.

A period-style choice for a 2021 Ford Trucks F-350 Super Duty starts with the exact size that belongs on the truck’s trim and wheel package. Because this is a modern heavy-duty pickup, keeping the correct factory-size family and wheel diameter usually does more for the truck’s intended appearance than chasing a different profile.

Appearance still depends on details such as sidewall presentation and overall stance. An RWL or RBL sidewall can change the truck’s visual character, but that decision should come after confirming the correct size, especially on trucks where DRW, Tremor, and upper-trim wheel packages all use different fitments.

Yes, correct tire fitment matters because the 2021 Ford Trucks F-350 Super Duty does not use one universal size across the lineup. A stock-style refresh looks most convincing when the tire size, wheel diameter, and overall stance match the truck’s original trim and configuration rather than another F-350 variant.

That is especially important with dual-rear-wheel trucks, Tremor trucks, and upper trims that carry larger wheels. Even when the truck is not being restored in a formal collector sense, confirming the original-style size family helps preserve proportion, clearance, and the visual balance Ford intended for that specific setup.

Yes, modifications can affect tire fitment on a 2021 Ford Trucks F-350 Super Duty. Aftermarket wheels, changes in wheel width or offset, suspension lifts or lowering, and body or fender changes can all alter how a given tire size sits in the wheel opening and how much steering or suspension clearance remains.

That is especially important on a truck with multiple stock sizes and rim diameters already in play. If the F-350 has been modified, check wheel diameter, wheel width, and clearance at full steering lock and suspension movement before assuming the original replacement size is still the right choice.

Before road use, inspect tire pressure, lug-nut torque, visible tread and sidewall condition, and any signs of rubbing once the new tires are mounted. It also helps to confirm that the installed size matches the truck’s actual wheel diameter and configuration, especially on F-350 Super Duty models with several possible stock fitments.

A short local drive is a smart follow-up before putting the truck into heavier service. Listen for contact during turns, recheck inflation, and look again at fender, suspension, and dual-wheel clearances where applicable so any fitment issue is caught early rather than under load.

Before a longer drive, check tire pressure, tread condition, sidewall condition, and any sign of cuts, bulges, or air loss. On a 2021 Ford Trucks F-350 Super Duty, it also makes sense to confirm that all tires match the truck’s intended size and service type, especially on dual-rear-wheel setups.

A longer trip puts more importance on heat buildup, sustained load, and consistent clearance. Looking over wheel hardware, checking for uneven wear, and making sure the tire’s load specification suits how the truck will be used can prevent a simple fitment oversight from becoming a road-use problem.