I finally got my custom machined chainrings done for my Rotor cranks on my S-Works. I did all the design, reverse engineering, and machining myself. I couldn't find any mountain specific 39T 110 bcd rings for the life of me so I decided I would make my own. The only thing I didn't do was was the anodizing which was done by a fellow MTBR member.
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Thread: Custom CNC Chainring