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Chainring Bolt Circle Diameter Measurement
It's important to have the correct bolt circle diameter (BCD) when ordering replacement chainrings. Use the diagram and chart below to determine your BCD:
Measure the distance in millimeters between two adjacent chainring mounting holes (center to center). Use this distance (x) to find your BCD in the chart below:
Distance (x) BCD 5 hole chainrings 34.3mm 58mm 43.5mm 74mm 55.4mm 94mm 64.7mm 110mm 71.5mm 122mm 76.4mm 130mm 79.5mm 135mm 84.6mm 144mm 4 hole chainrings 41.0mm 58mm 45.3mm 64mm 48.1mm 68mm 73.6mm 104mm 79.2mm 112mm
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