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Electric Scooter Repair Help > Modification and Custom Project Help > How To Measure Bolt Hole Center To Center Distance

 

How To Measure Bolt Hole Center To Center Distance

 

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

Step 2 - Measure Bolt Hole Back To Back Distance

Step 3 - The Digital Caliper Readout Is Now the Bolt Hole Center To Center Distance

Measuring the bolt hole center to center distance or back to back distance and using the bolt circle diameter calculator located above or using a mathematical formula is the only way to determine the bolt circle diameter of chain 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 to determine the bolt circle diameter.

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