2025 Ford F-250 Lifted with 20×9 KMC GRS KM549 and 40×13.50R20 Tires

This 2025 Ford F250 wears a set of US MAGS Flagstaff wheels sized at 20×9 with an 18mm offset, and the whole thing sits on a lift that gives this Super Duty a serious working presence. Wrapped in 40×13.50R20 tires at all four corners, the truck trades its factory highway manners for a tall, planted footprint that fills the wheel wells the way a heavy-duty rig should. The Flagstaff design brings a rugged, no-nonsense look that pairs naturally with the boxy Super Duty lines, and the lift plus the 40s completely reshape how the truck carries itself. What used to look like a stock fleet hauler now reads as a purpose-built rig ready for trails, job sites, and everything in between.

Factory vs New Specs
The change here is dramatic. A stock F250 typically rolls on tires in the low-to-mid 33 inch range, so jumping to a true 40 inch tire adds roughly 6 to 7 inches of overall diameter. That translates to somewhere around 3 to 3.5 inches of extra ground clearance at the axle centerline before you even account for the lift itself. Width goes up too. Factory Super Duty wheels tend to run in the 8 inch range, so the 9 inch Flagstaff adds about an inch of extra rim width per corner, giving the meaty 13.50 wide tires a proper platform. Offset is the other big story. Where the factory setup usually sits in the higher positive offset territory, the 18mm offset on these Flagstaffs pushes the wheel and tire noticeably farther outward, roughly an inch and a half to two inches per side compared to stock. The result is a wider, more aggressive track width, a beefier stance, and a truck that plants harder and looks the part. Drivability shifts as expected with a build like this, with slightly heavier steering feel and a taller ride height, but that trade is exactly what buyers chasing this look are after.

Fitment Notes
With 40 inch tires on this Super Duty, fitment is a real consideration. Expect some rubbing at full lock or on hard articulation if trimming and proper clearance work are not addressed, and most builds at this tire size will need some trimming of the front bumper corners or fender liners to run clean. Given the 18mm offset, the setup pokes past the factory fender line, so figure on roughly 1 to 1.5 inches of poke outside the stock fenders depending on flare configuration. A lift is absolutely required to fit 40s on an F250, and this truck already has one. Plan on a 4 inch or taller suspension lift as a realistic starting point to clear this tire without major cutting. This is not a stock suspension setup and should not be attempted as one. The lift is what makes the whole package work.

Fitment Dynamics carries a full selection of wheels, tires, and suspension upgrades for the 2025 Ford F250, including US MAGS wheel & tire packages. You can shop in our Miami showroom, order online for local pickup, have your setup shipped nationwide directly to your doorstep, or have everything professionally installed at our Medley, FL location.