Ford Trucks F-350 Super Duty FX4 Tires

Ford Trucks F-350 Super Duty FX4 uses two tire sizes in the 2008 to 2009 range: 245/75R17 and 275/70R18. The 245/75R17 size fits 17-inch wheels, while the 275/70R18 size fits 18-inch wheels. Both are radial truck tires, and each size appears in both 2008 and 2009 applications rather than being tied to only one model year.

That means year alone is not enough to choose a tire for Ford Trucks F-350 Super Duty FX4. Check the actual wheel diameter on the truck first, then match the tire size to that wheel. If the truck has been fitted with different wheels over time, the current wheel size matters more than the badge year when selecting between these two fitments.

On a Ford Trucks F-350 Super Duty FX4, the size 275/70R18 breaks down into four parts. The 275 is the tire's nominal section width in millimeters, 70 is the aspect ratio, R means radial construction, and 18 is the rim diameter in inches. This is the larger wheel fitment used on some 2008 and 2009 Ford Trucks F-350 Super Duty FX4 trucks.

Understanding that code helps you avoid one of the most common heavy-duty truck mistakes: matching overall look instead of matching wheel diameter and load-capable sizing. If your Ford Trucks F-350 Super Duty FX4 has 18-inch wheels, this size is the relevant one to evaluate. It is also wise to confirm the wheel width, since the listed compatible range for this tire is 7.0 to 9.0 inches.

A 2008 Ford Trucks F-350 Super Duty FX4 has two tire sizes listed because the model appears with two different wheel diameters: 17-inch and 18-inch. The two sizes are 245/75R17 and 275/70R18, and both are radial constructions rather than a bias-ply-versus-radial split. This is a wheel-and-configuration split, not a change from one production year to the next.

The practical takeaway is that you should identify the wheel already on your 2008 Ford Trucks F-350 Super Duty FX4 before choosing a tire. A quick sidewall check, wheel measurement, or review of the truck's current setup will usually settle it. Once the wheel diameter is confirmed, the correct tire size becomes much clearer.

Ford Trucks F-350 Super Duty FX4 uses either a 17-inch or 18-inch rim in the 2008 to 2009 range covered here. The 245/75R17 fitment belongs on 17-inch wheels, and the 275/70R18 fitment belongs on 18-inch wheels. Both rim diameters are present in both years, so there is no clean year break from one to the other.

That makes wheel verification the first fitment check on any Ford Trucks F-350 Super Duty FX4. Do not rely only on the model year or assume all FX4 trucks were equipped the same way. If the truck has had wheel changes during its working life, the current wheel diameter determines which of these two tire sizes is appropriate.

To confirm the right tire size for a 2009 Ford Trucks F-350 Super Duty FX4, start by checking whether the truck has 17-inch or 18-inch wheels. The two listed fitments are 245/75R17 for 17-inch wheels and 275/70R18 for 18-inch wheels. Both sizes appear for 2009, so the model year by itself does not narrow it to one option.

After confirming wheel diameter, compare the current wheel width against the listed ranges for the available tires. The 245/75R17 product fits 6.5 to 7.5 inch wheel widths, while the 275/70R18 product fits 7.0 to 9.0 inch wheel widths. That extra check helps ensure the tire is suited to the wheel already on your Ford Trucks F-350 Super Duty FX4.

The available Ford Trucks F-350 Super Duty FX4 tires listed here use RWL sidewalls. RWL stands for raised white letters, a style commonly chosen on truck and all-terrain applications because it gives the tire a more purposeful, period-appropriate off-road look. Both listed sizes share that same sidewall presentation.

If you want a matching appearance on a Ford Trucks F-350 Super Duty FX4, that consistency makes selection simpler because there is no sidewall-style split between the two sizes shown here. The main decision remains wheel diameter and size, not white-letter versus blackwall styling. Buyers restoring the truck's original stance usually focus first on wheel size, then sidewall appearance.

Ford Trucks F-350 Super Duty FX4 tires in the sizes listed here are not identified as made-to-order items. The available products are radial BFGoodrich All-Terrain T/A KO2 tires in 245/75R17 and 275/70R18, and neither listing carries a made-to-order attribute. That means the key product distinction here is size and wheel match rather than special-build status.

For a Ford Trucks F-350 Super Duty FX4 buyer, the more important question is whether the truck uses the 17-inch or 18-inch wheel package. Once that is settled, you can compare the load and wheel-width specifications to the truck's intended use. On a heavy-duty pickup, choosing the correct fitment matters more than chasing minor differences in labeling.

A Ford Trucks F-350 Super Duty FX4 should be stored on a clean, dry surface away from direct sunlight, ozone sources, and long-term exposure to extreme temperatures. Tires age faster when they sit under sustained load without movement, especially on a heavy-duty truck. Keeping inflation correct and moving the truck periodically helps reduce flat spotting and sidewall stress.

If the Ford Trucks F-350 Super Duty FX4 will sit for extended periods, many owners either roll it occasionally or support some of the vehicle weight to reduce strain on the tires. Avoid storing the truck with visibly underinflated tires. Good storage habits preserve both ride quality and casing condition, which is especially important on a truck built to carry substantial weight.

Tires on a Ford Trucks F-350 Super Duty FX4 should be inspected regularly even if the truck is not driven often. A visual check before use and a more thorough inspection at routine service intervals is a sensible standard for a heavy-duty pickup. Look for cracking, punctures, irregular wear, tread damage, and any signs that inflation has drifted from the intended pressure range.

Because Ford Trucks F-350 Super Duty FX4 may be used for towing, hauling, or occasional off-pavement driving, inspection should also include the wheel, valve stem, and sidewall after any demanding use. Catching a problem early is especially valuable on a heavier truck where loads can magnify tire stress. Uneven wear can also point to alignment or suspension issues that should be corrected promptly.

Tires on a Ford Trucks F-350 Super Duty FX4 should be replaced when age, cracking, impact damage, sidewall injury, or structural concerns appear, even if the tread still looks usable. Tread depth alone does not tell the full story on a low-mileage or intermittently used truck. Any tire showing separation, severe weather checking, or damage from overload or underinflation has reached the point where replacement should be strongly considered.

That is particularly important on a Ford Trucks F-350 Super Duty FX4 because heavy loads place greater demands on the casing than casual passenger-car use does. An older truck that is driven only occasionally can still have tires that have aged out before they have worn out. Regular age tracking and periodic professional inspection are the best ways to avoid relying on appearance alone.

The listed Ford Trucks F-350 Super Duty FX4 tires are modern radial truck tires with heavy-duty load ratings, so they are fundamentally suited to public-road use when they are correctly matched to the truck's wheel size and used in sound condition. The 275/70R18 product carries a maximum load of 3,640 pounds at 80 psi, while the 245/75R17 product carries 3,195 pounds at 80 psi. Safe road use depends on selecting the correct size, maintaining proper inflation, and keeping the tires free from age or damage issues.

Before regular driving, make sure the Ford Trucks F-350 Super Duty FX4 is wearing the correct tire for its 17-inch or 18-inch wheel package. Also consider how the truck is actually used, especially if it tows or hauls. A tire that is safe in general can still be the wrong choice if wheel diameter, load demands, or condition are not properly matched.

Before driving a Ford Trucks F-350 Super Duty FX4, check inflation pressure, visible tire condition, tread wear, and any obvious cuts, bulges, or embedded damage. Confirm that all four tires match the wheel diameter they are mounted on and that the wheel width is appropriate for the tire size. On a heavy-duty truck, uneven wear or a low tire can quickly become more serious once the truck is loaded.

It is also wise to think about the truck's intended use that day. A Ford Trucks F-350 Super Duty FX4 going to a show places different demands on its tires than one carrying cargo or towing. A short pre-drive walkaround often catches small issues before they become roadside problems, especially on trucks that spend part of their lives parked between uses.

A sensible road speed for a Ford Trucks F-350 Super Duty FX4 depends on the condition of the tires, the load on the truck, and whether the tires match the correct 17-inch or 18-inch wheel package. The listed products are modern radial light-truck tires rather than fragile early-era reproductions, so normal road driving is realistic when the truck is mechanically sound and the tires are properly inflated. Speed should still be moderated by load, road surface, and tire condition.

That means a Ford Trucks F-350 Super Duty FX4 used for towing or hauling deserves a more conservative approach than an empty truck on a casual drive. Heat, load, and pressure all interact at speed, especially on heavy-duty applications. If the truck has older tires, uncertain service history, or signs of casing fatigue, restraint is the safer path until the setup is fully evaluated.