QUICK EXAMPLE
Ford's 2026 specifications list 265/70R17 (31.61″ calculated diameter) for the XL 4x4 and 275/65R18 (32.07″) for the STX, XLT and Lariat 4x4, a +1.5% difference, so an indicated 60 mph is about 60.9 mph. The Raptor is listed with LT315/70R17 (34.36″) and, with the 37 Package, 37x12.5R17 (37.00″ nominal), +7.7%. Ford's documents do not list lift limits, fender clearance or bolt pattern, so use the calculator for the arithmetic and confirm other sizes with a Ford dealer.
Decode a Metric Tire Size
F-150 common sizes — quick load:
Ford Tire Sizes by Trim — From Ford Spec Sheets
XL / XLT / STX / Tremor
2026 spec sheetLug nut torque: 150 lb-ft (204 Nm), M14 x 1.5
Lariat / King Ranch / Platinum
2026 spec sheetLug nut torque: 150 lb-ft (204 Nm), M14 x 1.5
F-150 Raptor / Raptor R
2026 spec sheetLug nut torque: 150 lb-ft (204 Nm), M14 x 1.5
F-150 Lightning EV
2022–2025 manualsLug nut torque: 150 lb-ft (204 Nm), M14 x 1.5
OEM Tire Sizes by F-150 Trim
Sizes are from Ford's 2026 F-150 specifications. Diameters are calculated from the size.
| Trim | Size (Ford) | Diameter (calc.) | Standard / Optional |
|---|---|---|---|
| XL, XLT 4x2 | 245/70R17 all-season | 30.50″ | Standard |
| XL 4x4 | 265/70R17 all-terrain | 31.61″ | Standard |
| XL Fleet, FX4 Package | 265/70R17C all-terrain | 31.61″ | Optional |
| STX, Lariat 4x2 | 265/60R18 all-season | 30.52″ | Standard (XLT 4x2: optional) |
| STX, XLT, Lariat 4x4 | 275/65R18 all-terrain | 32.07″ | Standard |
| XLT 4x4 | 265/70R18C all-terrain | 32.61″ | Optional |
| Tremor | 275/70R18 all-terrain | 33.16″ | Standard |
| STX, Lariat | 275/60R20 all-season (4x2) or all-terrain (4x4) | 32.99″ | Optional |
| King Ranch, Platinum | 275/60R20 all-season (4x2) or all-terrain (4x4) | 32.99″ | Standard |
| STX Lobo, King Ranch, Platinum | 275/50R22 all-season | 32.83″ | Optional |
| Raptor | LT315/70R17 all-terrain | 34.36″ | Standard |
| Raptor 37 Package | 37x12.5R17 all-terrain | 37.00″ (nominal) | Optional |
Lightning: Ford's documents do not list tire sizes by trim (275/65R18 is named only as the snow chain size). Earlier spec sheets (2021 and 2024) list 245/70R17, 265/70R17C or LT265/70R17C, 265/60R18, 275/65R18, 265/70R18C, 275/60R20, 275/50R22 and 275/70R18 (Tremor).
Popular F-150 Tire Upgrades
Each row compares two sizes that Ford lists. The differences are calculated.
| From | To | Diameter Change (calc.) | Change % | True Speed at 60 mph Indicated |
|---|---|---|---|---|
| 245/70R17 | 265/70R17 | +1.10″ | +3.6% | 62.2 mph |
| 265/70R17 | 275/65R18 | +0.47″ | +1.5% | 60.9 mph |
| 265/60R18 | 275/65R18 | +1.56″ | +5.1% | 63.1 mph |
| 275/65R18 | 275/70R18 | +1.08″ | +3.4% | 62.0 mph |
| 275/65R18 | 275/60R20 | +0.92″ | +2.9% | 61.7 mph |
| 275/60R20 | 275/50R22 | -0.17″ | -0.5% | 59.7 mph |
| LT315/70R17 | 37x12.5R17 | +2.64″ | +7.7% | 64.6 mph |
F-150 Bolt Pattern & Wheel Specs
Lug nut thread and torque: M14 x 1.5, 150 lb-ft (204 Nm). Ford says to retighten within 100 miles after any wheel disturbance.
Spare tire wheels: 17x8.5 with 34 ET for LT315/70R17, and 17x8.5 with 32 ET for 37x12.5R17LT.
Ford's owner's manuals and specification sheets do not list bolt pattern, centre bore or offset for the road wheels, so this page does not show them. Confirm them with a Ford dealer or the wheel maker.
How to Use the F-150 Tire Size Calculator
Decode Size
Enter any metric size, or click a Ford-listed preset, to see overall diameter, sidewall height, circumference and revolutions per mile.
Compare Sizes
Enter the stock size and another size to see the diameter change, speedometer error and true speeds. Continental advises keeping rolling circumference within 3% of the original; this is not a Ford specification.
Gen Fitment
Pick a trim group to see the Ford-listed sizes, wheel notes and lug nut torque, then compare a size of your own against the Ford size.
By Diameter
Enter a target diameter and rim size to list standard metric sizes within ±2%.
How the Calculator Works
All calculations use the standard tire diameter formula: Diameter = (2 × Width × Aspect/100 / 25.4) + Rim
Worked example — 265/70R17 to 275/65R18
- 265/70R17: 265 × 0.70 = 185.5 mm ÷ 25.4 = 7.30″; 17 + (2 × 7.30) = 31.61″
- 275/65R18: 275 × 0.65 = 178.75 mm ÷ 25.4 = 7.04″; 18 + (2 × 7.04) = 32.07″
- Delta: 32.07 − 31.61 = +0.47″ (+1.5%); true speed at 60 mph indicated = 60 × 32.07 ÷ 31.61 = 60.9 mph
More F-150 detail is in the F-150 tire size guide. A taller tire also changes gearing (see the effective gear ratio calculator), and the truck tire size calculator handles other trucks.