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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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Origin8 130mm 5-bolt Alloy Blade Chainrings, 42T, 8/9sp, Silver
your price $34.37
Buy PART NUM 749766
Understanding Chainring Measurements
