122mm Bolt Circle Diameter, 5-Bolt chainrings

122mm Bolt Circle Diameter (BCD), 5-Bolt chainrings on this page:
Stronglight 49D: 46-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.

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Stronglight 49D 46-tooth chainring. Used, $50.00/each

We are selling this inner ring

You can see some of the 46-tooth inner in this picture.