Or whatever ideal is with 120mm rear hub spacing
Right now, I use a 68x103mm and when the chainring is on the inside, the cl is 38/39mm. When I stick the ring on the outside of the crankset, it is about 45mm.
Do I need to go to a 107mm or 110mm to get the chainline to the 42mm I'm looking for (chainring on inside I assume is the only way)?