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Blackspire 130 Bicycle Chainrings

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.

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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.

Chainring Teeth

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These rings can be used in single ring applications.

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