* 8x170mm (8x6.5"): This is the most common bolt pattern for a 1999 Ford F-250.
* 8x165.1mm (8x6.5"): While less common, some 1999 F-250s might have this pattern. The difference is subtle, but important for wheel fitment.
To be absolutely certain, you should:
1. Check your owner's manual: This is the most reliable source.
2. Look at your existing wheel: The bolt pattern is usually stamped on the wheel itself.
3. Check the hub: The bolt pattern is visible on the wheel hub.
Don't rely solely on online information. Using the wrong bolt pattern can be extremely dangerous.
