How to Calculate Bolt Circle Diameter?
Bolt Circle Diameter calculator uses Bolt Circle Diameter = Outside Diameter of Gasket+(2*Nominal Bolt Diameter)+12 to calculate 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 calculate Bolt Circle Diameter using this online calculator? To use this online calculator for Bolt Circle Diameter, enter Outside Diameter of Gasket (Go) & Nominal Bolt Diameter (db) and hit the calculate button. Here is how the Bolt Circle Diameter calculation can be explained with given input values -> 4.112 = 1.1+(2*1.5)+12.