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ltc
AlexD
Assuming Hollowtech?. Chainline will be something like 43.5mm I think, which if it's a double will be halfway between the two rings, so you could put the chainring on the inside and I think that would make the chainline 41mm. You could then space it out with a BB spacer to get it bang on 42mm (if thats what you're after)
That sounds right in my head, but someone with actual chainline chops might be able to confirm.