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.
These rings can be used in the inner position.
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These rings can be used in the middle position.
These rings can be used in the outer position.
These rings can be used in single ring applications.
These single chain rings have special properties which help retain the chain on the ring.
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