Bolt Circle Diameter evaluator uses Bolt Circle Diameter = Outside Diameter of Gasket+(2*Nominal Bolt Diameter)+12 to evaluate the Bolt Circle Diameter, Bolt Circle Diameter is the diameter of the circle that goes through the center of all of the bolts on a chainring. Bolt Circle Diameter is denoted by B symbol.
How to evaluate Bolt Circle Diameter using this online evaluator? To use this online evaluator for Bolt Circle Diameter, enter Outside Diameter of Gasket (Go) & Nominal Bolt Diameter (db) and hit the calculate button.