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Amen, I rarely need to use a 52T, especially on touring/exploring type rides, so I run a 48/34 on a 5-bolt 110mm square taper crank. That also allows me to get the narrowest chainline possible; because I very rarely use the 2 smallest sprockets (even with a 48T chainring) I don't care about having perfect-on-paper chainline, it works better 95% of the time to have a straighter chainline to the bigger sprockets. Obviously none of that is possibly with external BBs.
ffm
hippy
God bless TA specialties.
A modern(ish) carbon campag record 53/39 strangely didn't have enough clearance on my MGOOF corsa extra build under the front mech. TA specialties do a replacement 50t ring which not only fitted but has been a godsend from a riding perspective.