I've always run a single 2.5 mm spacer on the drive side to give what I thought was right around the recommended 51 mm chainline, using a Shimano 1x9 medium cage drivetrain, with Saint crank and 33T ring. I recently went to an X9 1x10 short cage setup and bumped up to a 34T ring and had one hell of a time getting the rear derailleur to move through all the gears smoothly....the chainline just looked off to the outside, so I removed the spacer which shortened it to right around 48-49 mm. With some more tweaking finally got everything buttery smooth, and it's been perfect ever since.
Anyone have similar issues, or am I just ignorantly missing something altogether? How much does it really matter to stick with that 51 mm chainline?
Really just curious more than anything!
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Thread: Bottlerocket chainline