What is the Bolt Circle Diameter (BCD) and How Do I Measure It? The bolt circle diameter (BCD) is a critical measurement in the cycling world, particularly when dealing with chainrings and cranks. It refers to the diameter of the circle that passes through the center of all the bolts on a chainring. Knowing how […]
What is the bolt circle diameter (BCD), and how is it measured?
What is the Bolt Circle Diameter (BCD), and How is it Measured? The bolt circle diameter (BCD) is a critical measurement in cycling, referring to the diameter of the circle that passes through the center of the mounting holes on a bicycle’s chainring or crankset. To measure BCD, you need to determine the distance between […]