To quote Jim from Sickbikeparts
"The hub radius is 1.06 inches or a 2.12 diameter. The hole spacing is about
1.33 radius or 2.66 diameter in a 5 bolt pattern."
= 67.733333mm BCD
however, the word "about" doesn't exactly inspire confidence in the accuracy.
I am mesuring this for an hour now and measured this:
Measuring is made according to ISO17025
Measured with 3 different
hub diameter is oval and it is between 53,68 and 53,73mm
Then I measured from top of the hole to outher dia (2,62) and measured hole (5,25mm). I measured outher diameter and found out it is 77,78 so calculated BCD:
77,78-(2x2,62)-5,25 = 67,29
Then I measured from one hole to another and calculated BCD from pentagon and the result was 67,31mm
Then I repeated all starting with different hole each time.
maximal result was 67,82mm
This pissed me off that I couldn't measure diameter so I am taking it to 3d probe on Monday.
I guess the circle with holes is not concentric with other circles.