Product Info -01, -02 and -03: DoubleFD-4700 Max chainring: 53T: Max capacity: 16T Chainline: 43.5mm -04, -05 and -06: TripleFD-4703 Max chainring: 50T: Max capacity: 20T Chainline: 45mm Compatible only with Tiagra 4700 or GRX RX400 shifters