What size tires are on a 2018 Ford F350?
The tire size on a 2018 Ford F-350 varies by model, trim level, and wheel package, so there isn’t a single universal size for all trucks. The most common factory sizes you’ll encounter are associated with 18-inch and 20-inch wheels, with dual rear wheel (DRW) configurations using larger, 19.5-inch tires. Always verify the exact size for your specific truck on the door placard or build sheet.
Understanding the range of sizes
Because the F-350 was offered with multiple wheel and configuration options, the factory tire size depends on whether the truck uses a single rear wheel (SRW) setup or a dual rear wheel (DRW) setup, as well as the diameter of the wheels installed from the factory. The following are common factory sizes by wheel configuration.
- 18-inch wheels (typical on many XL, XLT, and some Lariat configurations): LT275/65R18
- 20-inch wheels (optional on higher trims or special packages): LT275/65R20
- Dual rear wheel (DRW) setups with 19.5-inch wheels: commonly 245/70R19.5 or 255/70R19.5
Keep in mind that exact tire sizes can vary by specific build and regional options, so use this as a guide rather than a definitive rule for every 2018 F-350. The official size for your particular truck is determined by the factory specification on the door placard.
How to verify the exact tire size on your 2018 F-350
To confirm the precise tire size for your exact vehicle, follow these steps. The listed steps help ensure you’re looking at the correct size for your specific truck, especially if you’re considering tires from aftermarket options or checking a used vehicle.
- Check the driver’s door jamb placard: locate the “TIRE SIZE” field, which shows the factory-recommended size for the current configuration.
- Inspect the tire sidewall: read the size imprinted on the tire (for example, LT275/65R18 or 245/70R19.5).
- Consult the owner’s manual or window sticker/build sheet: these documents outline the original equipment tire size for your model and trim.
- If you’re working with a used vehicle or don’t have access to the documents, contact a Ford dealer or use the VIN to pull the factory build sheet, which lists the exact tire size.
Knowing the exact size is crucial for safety, performance, and load ratings. If you’re unsure about the current tires on your F-350, consult a dealership or tire professional before making replacements or upgrades.
Summary
The 2018 Ford F-350 does not have a single tire size across all configurations. Most common factory sizes include LT275/65R18 for 18-inch wheels, LT275/65R20 for 20-inch wheels, and 19.5-inch tires such as 245/70R19.5 or 255/70R19.5 for DRW models. To know your exact size, check the door placard, inspect the tire sidewall, or consult the vehicle’s build sheet or manual. Always verify the correct size before purchasing tires to ensure proper fitment and load capacity.
