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How to measure Bolt Circle Diameter (BCD). Bolt Circle Diameter or BCD is the diameter of the circle that goes through the center of all of the bolts on your chainring. On bicycle chainring this dimension is usually measured in millimeters.
The BCD is connected to the air tank by this device: BCDs usually have a thingy that looks like this: By pushing one button, some air from the scuba tank is put into the BCD. By pushing another, the BCD leaks out of the BCD. You are not supposed to use the BCD as an elevator, but instead to control your buoyancy.