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TA Nerius chainring
If you want a 52T ring to fit a Fulcrum compact crank, you need a TA Nerius, as Fulcrum uses the proprietary Campy 110 + 112mm BCD. TA makes inner rings of 34-42T, and outer rings of 48-53T in this standard. Most front derailleurs seem to have a capacity of 16T, so you would likely need to use a 52T big ring with a 36T small ring. Alternatively, you could try using a triple front derailleur.
If you want a 52T ring to fit a Fulcrum compact crank, you need a TA Nerius, as Fulcrum uses the proprietary Campy 110 + 112mm BCD. TA makes inner rings of 34-42T, and outer rings of 48-53T in this standard. Most front derailleurs seem to have a capacity of 16T, so you would likely need to use a 52T big ring with a 36T small ring. Alternatively, you could try using a triple front derailleur.