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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
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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Shimano XT SM-CRM85 28t 1x Chainring for M8100 and M8130 Cranks, Black
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Understanding Chainring Measurements
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