Spec X5 Overland Build

[KEI7]

Great thread!

I believe this is the most thorough off-road build thread ever.

Thank you for write up!

How did you meet the 120 PCD with the Cragars?
Custom ordered?

[thstone]

Originally Posted by KEI7

Great thread!

I believe this is the most thorough off-road build thread ever.

Thank you for write up!

How did you meet the 120 PCD with the Cragars?
Custom ordered?

Thanks, glad that you're enjoying the thread!

In regards to PCD (pitch circle diameter), the BMW 5x120mm is very close in size to the Cragar 5x4.75 inch PCD so they fit without any adapter, modifications, or customization.

To dive a little deeper, 120mm is 4.724", not 4.75". The 0.026" difference (otherwise known as 26 thousandths of an inch or 26 thou) is within the manufacturing tolerance of the hubs and the wheels. So while there is a real measurable difference, in practice the wheels mount fine and can be fully torqued.

The best way to sum this up is to say that while 120mm does not equal 4.75", wheels with a 5x4.75" PCD will fit a 5x120mm PCD wheel hub.

With that being said, it is up to each owner to decide if "close enough that works" is acceptable to them. I completely understand why someone might want a true 5x120mm/4.724" PCD wheel to mount on a 120mm PCD hub and would refuse to install anything else. That's how BMW designed it and BMW certainly knows what they are doing.

In my particular case, I am ok with installing a 5x4.724" PCD wheel on a 5x120mm hub. Your mileage may vary.

I hope that I fairly summarized the different sides of this issue.

[KEI7]

Thank you! VERY clear!

Your wheels really bring ruggedness into the vehicle.
They look way better than bmw 17 inches

Originally Posted by thstone

Thanks, glad that you're enjoying the thread!

In regards to PCD (pitch circle diameter), the BMW 5x120mm is very close in size to the Cragar 5x4.75 inch PCD so they fit without any adapter, modifications, or customization.

To dive a little deeper, 120mm is 4.724", not 4.75". The 0.026" difference (otherwise known as 26 thousandths of an inch or 26 thou) is within the manufacturing tolerance of the hubs and the wheels. So while there is a real measurable difference, in practice the wheels mount fine and can be fully torqued.

The best way to sum this up is to say that while 120mm does not equal 4.75", wheels with a 5x4.75" PCD will fit a 5x120mm PCD wheel hub.

With that being said, it is up to each owner to decide if "close enough that works" is acceptable to them. I completely understand why someone might want a true 5x120mm/4.724" PCD wheel to mount on a 120mm PCD hub and would refuse to install anything else. That's how BMW designed it and BMW certainly knows what they are doing.

In my particular case, I am ok with installing a 5x4.724" PCD wheel on a 5x120mm hub. Your mileage may vary.

I hope that I fairly summarized the different sides of this issue.