For Shimano 55mm chainline there are 2x 3mm spacers (one each side to achieve the 55mm chainline, so Q-Factor is 178mm compared to 172mm) in addition to the 2.5mm DS spacer.
Silly question but do those 3mm spacers come with the cranks or a BB?
Currently I have a SLX 12 speed chainset that gives me a 52mm chainline and the shifting is perfect.
I am expecting a M8120 XT chainset so I was planning to swap the 2.5mm to the non drive side to retain 52.5mm. But now I am a bit confused about the 3mm spacers that you mention. Do I need to fit them at all ? (if they come with the chainset).
Or is there a Super Boost 55mm BB ?