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Home > Chainrings & Bolts >
When buying chainrings you need to know the BCD aka Bolt Circle Diameter. This is the measurement of an imaginary circle on the chainring hitting all the bolt holes. The best way to calculate this is by measuring the exact distance (center to center) between 2 neighbouring bolt holes. Then find that number on the correct chart below to determine the BCD for your chainring and cranks...
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