* 5x5.5" (5x139.7mm): This is the *most likely* pattern for a 2001 Dodge Ram 2500 or 3500 with a turbo diesel.
* 5x150mm (6x139.7mm - some sources list this depending on how it's measured): Less common, but possible, especially on heavier duty models or aftermarket wheels.
To be absolutely certain, you need to:
1. Check your owner's manual: This will definitively state the correct bolt pattern.
2. Look at your existing wheels: The bolt pattern is usually stamped on the wheel itself.
3. Measure your existing wheels: Carefully measure the distance between two bolts, then multiply by two. This will give you the diameter of the bolt circle.
Don't rely solely on online resources without verifying with your vehicle's documentation or wheels. Using the wrong bolt pattern is extremely dangerous and could lead to a wheel detaching while driving.
