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74mm Bolt Circle Diameter chainrings

74mm Bolt Circle Diameter (BCD) chainrings on this page: Campagnolo 30-tooth | Stronglight 30-tooth | Sugino 28-tooth stainless steel

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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.

74mm BCD rings are the usual inner rings on triple cranksets.

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


Campagnolo 30-tooth 74mm BCD chainring. New, $40.00

Part# 62225

Campagnolo 30-tooth ring


Stronglight 30-tooth 74mm BCD chainring. New, $30.00

Part# 62088

Stronglight chainring

7075 aluminum alloy

Stronglight chainring

Here it is with its packaging


Sugino "Colorado" model 28-tooth stainless steel chainring. New, $25.00

Part# 62107

Sugino chainring