Originally Posted by
seamuis
If you can’t see a difference in your chainline without breaking out the callipers to measure it, then there’s really no chance that your chainline is the issue. Dura ace cogs are designed for racing. The tooth shape/profile, is designed for strength and positive engagement under heavy torque load. Some cogs are designed with smoother, rounder teeth profiles. My guess is this what’s causing the noise you’re hearing and I would guess it will get quieter over time. From what I can see in the photo, the teeth look fine. But if you’re asking if it’s worn, am I to assume you bought a used cog?
I'll have to put the cog back on and really check out the chainline to see if there's a visible difference. Thanks for the background on the DA, almost sounds like its part of the design.
The cog came from a friend. I'm running a 17t now, and wanted to try a 16 T. Its got some miles on it, but I found out the 16 T could fit on one side, and I can run a 17t freewheel without changing the chain length. Going to take this thing for a good spin!
Dave