VBC Chainring SetsDescription These are the VBC (Variable Bolt Circle) chainring sets. They come in two versions to fit either M A R G 30 cranks or ENO Square Taper Road cranks. Individual VBC rings are are available on the Inner VBC Chainrings page or the Outer VBC Chainrings page. When Doug saw the limitations presented by all the different bolt circle diameters required to manufacture chainrings, he figured there had to be a better way. Hey, how about no standard?,
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