The biggest tire size on the Ford F-150 ranges between 31 to 35 inches depending on the stock rim size. LT245/75R16 is equivalent to 31 inches and LT315/50R22 is equivalent to 35 inches. The stock rim size on this truck is 16 to 22 inches. The bigger rim can accommodate a bigger tire size. However, as per the general rule of thumb, you can increase 11 to 16% wider than the rim width or increase 20 mm section width along with the aspect ratio without any issue of rubbing or scrubbing.
This is just the surface of the biggest tire on the stock F150. Continue reading for a comprehensive list of the biggest tires on different-size rims.
Biggest Tire On Stock For Ford F150 On 16 Inches Rim
The Ford F-150 has 16-inch rims and the biggest tire that can fit on it is a 31-inch tire with an aspect ratio of LT245/75R16. However, this only applies to the 10th generation or earlier models of the Ford F-150.
If you want to fit a bigger tire, you need to make sure there is enough clearance for the wheel well, fender, and suspension. For the best fitment without any rubbing, you need 50 mm of clearance for the wheel well, 30mm for the suspension, and 50mm for the fender. Check out the table below for a summary of the biggest tire that can fit on the Ford F-150 with 16-inch rims.
| Stock Tire Size | Model Year | Biggest Tire On Stock (Diameter) |
| 235/70R16 (29 inches) | 1997-2004 | LT245/75R16 (31 inches) |
For the fitment of a bigger tire on stock, another considerable factor is the offset of the rim. A negative offset gives more space between the tire and the car’s suspension or body. This means that if you have a rim with a negative offset, you can fit a bigger tire. 
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Additionally, The Ford F-150 is an IFS truck, which means it has independent front suspension. This type of suspension doesn’t allow for significant increases in tire size without modifications. If you try to increase the tire size too much with a positive offset wheel, the tire will rub against the suspension.
Biggest Tire On Stock For Ford F150 On 17 Inches Rim
For a Ford F150 with a 17-inch rim, the biggest tire on a stock depends on the model year. For the years 2004-2014, the biggest tire in stock was the LT245/75R17 with a diameter of 32 inches. For the years 2015-2023, the biggest tire in stock is the LT285/70R17 with a diameter of 33 inches.
The Ford F-150 that comes between 2004 to 2014 with a 17-inch rim has a stock tire of 235/70R17 that has an overall diameter of 30. On the other hand, models between 2015 to 2023 with 17-inch rims have a stock tire of 245/70R17 tire with an overall wheel diameter of 31 inches.
Check out the table below to see a list of the largest tires you can put on a 17-inch rim Ford F-150.
| Stock Tire Size | Model Year | Biggest Tire On Stock (Diameter) |
| 235/70R17 (30) | 2004-2014 | LT245/75R17 (32) |
| 245/70R17 (31) | 2015-2023 | LT285/70R17 (33) |
If you want to fit an even bigger tire on a 17-inch rim, it’ll need some further modifications like fender trimming, or using a spacer or leveling kit.
Biggest Tire On Stock For Ford F150 On 18 Inches Rim
The biggest tire that can fit on the Ford F-150’s 18-inch rim without making any kind of modification is LT305/65R18 with a diameter of 34 inches. However, all the trims with 18-inch rims typically come with a 65/60R18 tire which has an overall wheel diameter of 31 inches.
The following table represents the list of the biggest tires on 18-inch rims.
| Stock Tire Size | Model Year | Biggest Tire On Stock (Diameter) |
| 265/60R18 (31 inch) | 2004-2023 | LT305/65R18 (34 inch) |
When you put a 34-inch tire on an F-150 truck with a dimension of 305/65R18, there will be enough space between the tire and the wheel well, fender, and suspension. This means that the tire won’t scrape against any nearby parts of the vehicle.
Biggest Tire On Stock For Ford F150 On 20 Inches Rim
The biggest tire on the Ford F-150’s 20-inch rims is 315/60R20 which has a diameter of 35 inches. However, with the introduction of the fourteenth generation, Ford began offering 20″ stock rims with a 75/60R20 tire that has a diameter of 33 inches.
The King Ranch 4dr SuperCrew and Platinum 4dr SuperCrew trims are the only ones that come with 20-inch rims. A general rule of thumb suggests that the tire’s section width can be increased by 20 mm from the stock size without causing any rubbing or scrubbing. However, since the Ford F-150 is a truck with larger wheel wells and fender clearance than passenger cars, it is possible to exceed this rule of thumb.
To provide further guidance on tire sizing, the table below displays the maximum tire size along with other relevant factors.
| Stock Tire Size | Model Year | Biggest Tire On Stock (Diameter) |
| 275/60R20 (33 inch) | 2021-2023 | LT315/60R20 (35 inch) |
If you want to go bigger than the provided biggest tire size on stock, your truck will need some further modifications. Nevertheless, if your intention is to upsize the tire for better offroading performance, a 35-inch tire is highly good for this purpose. A 35-inch tire on a Ford F-150 can give better off-roading shock absorption and ground clearance.
Biggest Tire On Stock For Ford F150 On 22 Inches Rim
The largest tire size available for Ford F-150’s 22-inch rims is 315/50R22, with an overall wheel diameter of 35 inches. It should be noted that this rim size is exclusively available on the Limited 4dr SuperCrew 5.5 ft variant of the Ford F-150, which comes with 22-inch stock rims. In contrast, the stock tire size for this rim is 275/50R22, which has an overall wheel diameter of 33 inches.
The following table presents the relevant data concerning the maximum tire size available for stock Ford F-150 22-inch rims:
| Stock Tire Size | Model Year | Biggest Tire On Stock (Diameter) |
| 275/50R22 (33 inch) | 2021-2023 | LT315/50R22 (35 inch) |
Due to the larger diameter of the stock rim, the flexibility for tire upsizing is limited. Significant tire upsizing on 22-inch rims will require substantial modifications.
FAQs
Do Bigger Tires Increase Speed?
Yes, bigger tires can increase speed, but there are also some downsides to consider. Larger wheel diameters can improve handling and make driving smoother, but they can also reduce acceleration. When you increase the size of your tires, your vehicle may have more difficulty accelerating quickly.
Do Bigger Tires Affect Fuel Economy?
Yes, bigger tires can negatively affect your fuel economy. This is because larger tires are heavier and have a higher rolling resistance, which means they require more effort to get them rolling. The increased weight and resistance can cause your engine to work harder and burn more fuel to maintain the same speed and acceleration as with smaller tires.
What Is The Disadvantage of Bigger Tires?
One of the main disadvantages of bigger tires is they can adversely affect a vehicle’s handling by raising its center of gravity, causing more body roll and load transfer, and reducing stability when braking and cornering, especially at high speeds. Changes to ride height or alignment angles may require recalibration of Advanced Driver Assistance Systems. Automaker warranties may be voided if a suspension modification is made. Bigger tires also reduce fuel economy due to increased rolling resistance.
Final Words
Well, this was all about the biggest tire on the Ford F-150. While upsizing your tire you should always consider its consequences first.
Upsizing is not always beneficial, especially if you do it without considering facts that influence the combination of tire and vehicle.
Thank You!
