Details zu Lochkreismustern bei Kettenblättern: Unterschied zwischen den Versionen

I sent results to Wolf Tooth and received confirmation that they were correct, validating my method and allowing me to trust it as I applied it to other chainrings. I found a few measurements of other chainrings with unevenly-spaced bolt holes on the Wolf Tooth site which further confirmed my measurements.

If the manufacturer has given the bolt-circle diameter, the task of measurement is easier. The scale of the photo can be determined directly from the radii from the center to the bolt holes. The FSA chainring in the photos below is clearly marked as having a 110mm bolt-circle diameter.

Results of these calculations are on the bolt-circle diameter cribsheet page and in the templates which my son Jacob has generated. You can print out the templates to check chainring dimensions.