What is the bolt pattern on a Ford dually?
Ford duallies use an eight-lug pattern on a 170 mm bolt circle (8x170) for most modern Super Duty models, including the F-250, F-350, and F-450. Always verify for your exact year and trim, since aftermarket wheels and occasional production changes can vary.
Understanding the 8x170 mm pattern
The bolt pattern describes how many lug holes you have (eight) and the diameter of the circle those holes form (170 millimeters). For Ford's dual-rear-wheel trucks, this means eight studs spaced around a 6.69-inch circle, matching the factory wheels and most aftermarket dually wheels purpose-built for the platform.
Which Ford dually models use this pattern
In current Ford lineup, the standard 8x170 pattern is used on the heavy-duty Super Duty chassis when equipped with dual rear wheels. That includes:
- Ford F-250 Super Duty (dually configurations)
- Ford F-350 Super Duty (dually configurations)
- Ford F-450 Super Duty (dually configurations)
Note: Variations can occur for limited editions, export markets, or very early/late production runs; always confirm by checking the vehicle’s VIN or official spec sheet.
How to verify the bolt pattern on your truck
To avoid buying the wrong wheels, it's best to verify the lug pattern directly from your vehicle. The steps below help you confirm 8x170 or catch exceptions.
- Consult the owner's manual or the driver's door jamb placard for wheel and lug pattern specifications.
- Measure the bolt circle diameter if needed: draw a straight line through two opposite lug holes and measure the distance across the center of the hub; this is the bolt circle diameter.
- Count the number of lug studs; Ford dual rear-wheel Super Duty vehicles typically have eight lug studs per wheel.
- If buying aftermarket wheels, confirm product specs with the seller and confirm hub bore compatibility and offset.
With these checks, you can confidently source correct wheels, adapters, or replacement parts for your dually.
Summary
The Ford dually uses an 8x170 mm lug pattern (eight lugs on a 170 mm bolt circle) for most modern Super Duty dual-rear-wheel pickups. Always verify against your exact model year and VIN, as there can be rare exceptions or aftermarket variations. This knowledge helps when shopping for wheels, tires, or upfits.
