130mm Bolt Circle Diameter chainrings

130 Bolt Circle Diameter (BCD) chainrings on this page: Mavic 631 42-tooth

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Bolt Circle Diameter is the diameter of the circle formed by the centers of the chainring fixing bolts. With 4-bolt cranksets, this is easy to measure. 5-bolt cranks are more difficult.

If you are unsure about what size chainring you need, Wolf Tooth Components has an excellent guide to measuring your rings.

Mavic 631 42-tooth chainring. New, $60.00

Part# 62182

The ring is new with its factory bag

Close-up

And the other side