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BCD chart
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Bolt Circle Diameter (BCD) chart used to measure chainring sizes for bikes
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Model information
- Source
- Printables
- Category
- Tools
- License
- Creative Commons — Attribution — Noncommercial
Since the tool made by a popular blue bike tool company was discontinued, I designed my own BCD chart with additional standard measurements the orginial tool didn't have.
To use it, put the two pointy tips in two adjacents chainring bolt holes and the tool will show what the BCD is. It supports both 4 and 5 holes chainrings. Asymetrical BCD is not suported by this tool.
More info on what BCD is: https://www.sheldonbrown.com/cribsheet-bcd.html