What size is a 1978 ford f100 bolt pattern?

The 1978 Ford F-100's bolt pattern depends on the wheel size and options chosen. There wasn't a single standard. You'll need to check the truck itself to be sure. However, the most common bolt patterns for that year are:

* 5 on 5.5 inches (5x139.7mm): This is the *most likely* bolt pattern for a 1978 Ford F-100.

To be absolutely certain, check one of the following:

* The wheels themselves: The bolt pattern is usually cast into the wheel.

* The owner's manual: If you have the original manual, it should specify the bolt pattern.

* The vehicle identification number (VIN): While the VIN doesn't directly state the bolt pattern, a Ford parts specialist or online database might be able to determine it based on the VIN.

Don't rely solely on year; always check the truck itself or its documentation for definitive confirmation.