We know it can be confusing to figure out what chainring you need to buy sometimes. Standard have change over time and muddied up the chainring bolt center diameter waters. Park Tools CDG-2 will easily and accurately measures bolt circle diameter (BCD) in millimeters for a wide variety of four- and five-bolt chainring patterns. Made of anodized aluminum and permanently laser engraved, the tool centers itself in chainring holes, chainring bolts, or crank arm holes. It also includes a center-to-center distance scale and a handy reference chart listing additional mounting pattern measurements.
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