HOW TO MEASURE BRAKE DISC ROTOR

Date Posted:9 October 2020 

HOW TO MEASURE BRAKE DISC ROTOR main image HOW TO MEASURE BRAKE DISC ROTOR image

Take the guess work out of the equation by following this short tutorial on how to measure your brake disc rotor

Please note: All measurements are in mm

1. ID = Inside Diameter: Measure from inside edge to inside edge.

2. OD = Outside Diameter: Measure from outside edge to outside edge.

3. Measurement from inside edge of mounting hole to inside edge of bolt hole.

4. Bolt hole diameter: measure from inside edge of bolt hole to opposite inside edge.

5. BHC = Bolt Hole Circle or PCD= Pitch Circle Diameter: To measure this, use the following equation;

ID + (2 x Measurement 3) + Measurement 4
Eg: 90 + ( 2 x 1.5 ) + 17 = 110mm

6. Thickness: Stand disc vertically to measure the thickness.

 
7. Offset: Place your disc on a flat surface and measure from the surface to the top of the disc (including the disc thickness)

 
8. Types of bolt holes