Ah okay that makes sense. So with modern chainrings on the cranks, the distance between the front and rear chainring with be the same (or similar enough) to work with a modern derailleur? and chainline should be fine and all that kind of stuff? Thanks for the help by the way.
Totally disagree. The differences between them are microscopic and make zero difference to real world operation, especially given a double front mech is far from a precision instrument.
Ah okay that makes sense. So with modern chainrings on the cranks, the distance between the front and rear chainring with be the same (or similar enough) to work with a modern derailleur? and chainline should be fine and all that kind of stuff? Thanks for the help by the way.