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0:00 common problems 1:19 1. teeth 4:19 2. mounting 6:22 3. what is BCD 10:44 4. chainline 18:30 5. compatibility What is BCD Bolt Circle Diameter and PCD Pitch Circle Diameter: This is the diameter of the circle along which the centers of the mounting bolt holes are located. How to calculate BCD with five mounting bolts: Measure the distance between the centers of adjacent bolt holes and multiply that value by 1.701. E.g. 64.7 (distance) x 1.701 = 110 BCD How to calculate BCD with three mounting bolts: Distance x 1.155. What is OLD Over Lock nuts Dimension: This is the distance between the outer edges of the hub cones or the spacing of the frame dropouts where the wheel is attached. Where to buy: Shimano chainrings https://bit.ly/3VFd0hN Sram chainrings https://bit.ly/3XkiKPd