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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.
On a chainring with 4 bolts the BCD is the distance between two bolts across from each other. It can be somewhat difficult to make this measurement if you don't have a caliper since the crankarm gets in the way. The image below shows this measurement on a 104mm BCD chainring.