Might this help? https://productinfo.shimano.com/#/spec/MTB/Crankset
Hmmm, only gives 1 chainline for any crankset, single double or triple.
Might be actual chainline for 1x, middle of the spider for 2 x and middle ring for 3x?
Might be actual chain;line for 1x, middle of the spider for 2 x and middle ring for 3x?
Yes, that's generally the number Shimano specify.
@M_V started
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Might this help?
https://productinfo.shimano.com/#/spec/MTB/Crankset