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:

Chainring Bolt Circle Diameter Measurement

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:

Bolt Circle Diameter Chart

SIGN UP TO RECEIVE OUR NEWSLETTERS, EVENT INFO, SALES, PLUS MORE!
Sign Up Now