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Electric Scooter Repair Help > Modification and Custom Project Help > How To Measure Bolt Circle Diameter

 

How To Measure Bolt Circle Diameter

 

A Digital Caliper is Required to Obtain an Accurate Measurement

Only the bolt circle diameter (BCD) of an even number of bolt holes can be measured this way. For sprockets, rims, axle hubs, and brake rotors with an odd number of bolt holes or with an even number of bolt holes where there is an axle or rim that gets in the way of measuring the diametrically opposed bolt holes the adjacent bolt hole distance will need to be measured and our Bolt Circle Diameter Calculator can be used to determine the bolt circle diameter.

Step 1 - Measure Bolt Hole ID and Zero the Digital Caliper

Step 2 - Measure Diametrically Opposed Bolt Hole Back To Back Distance

Step 3 - The Digital Caliper Readout Is Now the Bolt Circle Diameter

 

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