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3 days ago · With our PDF templates -- example at right -- you can directly check the BCD for all chainrings in commercial production, old and new, of which we know. You identify the bolt pattern by laying a chainring down on a template printout and rotating the …

Bolt Circle Diameter (BCD) is the diameter of the circle that goes through the center of all of the bolts on your chainring. On bicycle chainrings this dimension is usually measured in millimeters. It is critical to know the BCD of your crankset when you are selecting a new chainring for your bike.

BCD is an acronym for Bolt Circle Diameter. It’s the measurement (diameter) of an imaginary circle passing through the centers of all the bolts in a round pattern – like chainring bolts that hold the rings to the crank.

Learn how to measure the bolt circle diameter on a bike's crankset to find the right chainring. Plus, a cribsheet to common BCD measurements.

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Chainrings are most often measured in reference to their Bolt Circle Diameter (BCD) depicted as Bin the above picture. BCD is literally the diameter of an imaginary circle that connects the centers of all the chainring bolts.

To determine the BCD of your chainrings, measure the distance between two adjacent chainring bolt holes from center to center. Use the measurement (X) to find your BCD on the chart below.

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Bolt Circle Diameter (BCD) is the diameter of an imaginary circle running through the center of the chainring mounting holes. It is always defined in millimeters. See measurement "A" in the diagram.