Originally Posted by
Bill Kapaun
" Here's a silly question: How do you measure the bolt circle diameter?
Measure the center-to-center distance between any two adjacent crank bolts.
32.9mm = 56mm BCD
33.4mm = 58mm
43.5mm = 74mm
55.4mm = 94mm
64.7mm = 110mm
76.4mm = 130mm
79.5mm = 135mm
84.6mm = 144mm