Closeup of the fracture on the hub, I am calling this 12 o’clock
And 3 o’clock
And 6 o’clock
And finally, 9 o’clock
The cross section of the collar fracture
Detail of the main collar fracture
Burnished? Before or after the failure??? I ran an unknown number of laps with the broken hub, and my thought is the burnishing would be much more severe if the race became loose, spun in the hub and contributed to the failure.