144mm Bolt Circle Diameter (Traditional Campagnolo) chainrings

144mm Bolt Circle Diameter (BCD) chainrings on this page: Mavic 630 53-tooth | Mavic 630 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.

144mm is the bolt circle diameter of an entire generation of 1960s, 70s, 80s and even 1990s cranksets, including Campagnolo, Sugino, Mavic, Stronglight, Ofmega, SR, SunTour, Gipiemme, Zeus as well as others.

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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Mavic Model 630 53-tooth 144 BCD chainring. Used, $65.00

Lightly used

The flip side

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Mavic Model 630 42-tooth 144 BCD chainring. Used, $65.00

All Mavic products are beautifully made, and this 42-tooth ring is no exception.

The flip side