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@johnnyringo
Hi, I recently watched that video of Bob's Garage where the guy works out chainline by doing lots of measurements.
Surely it's just as effective to look at the chain on the rear cog and observe the cog's teeth as the chain goes round. On the conversion I'm doing it's possible to see that chainline is out by 1-2mm - not much - but probably enough to warrant a spacer on the rear hub.