hi, this bike was designed as a gravel / tourer / bike packing model. See attached the frame drawing showing spec parameters. it is for FD top-pull and then a choice of either a 1x or a 2x setup. 1x is 50T max. the 2x setup suggested is Shimano 46/36T which is in line with gravel trends at the time. This is a rather old model - designed in 2017 now. Since 2017 Shimano has added a Gravel Specific range of parts - the GRX ,below from their Media Pack about FD options : GRX Front derailleurs (FD): Complementing the cranksets, the Di2 or Mechanical front derailleurs are built with 2.5mm more outbound clearance for wider tires (up to 42mm) to cope with riding on rough roads. This means GRX front derailleurs must be combined with Shimano GRX +2.5mm cranksets. Both RX800-series mechanical and Di2 front derailleurs are built to accommodate Shimano’s widest 17T front chainring 48-31T gear ratio whilst the FD-RX400 10-speed derailleur accommodates the 16T chainrings found on the RX600 46-30T 10-speed cranksets. Shimano Di2 FD’s can be perfectly adjusted using Shimano’s simple and integrated controls whilst mechanical FD’s bring an extremely light front shifting feeling with an ergonomic power curve, toggle link construction for more cable routing options and an integrated cable tension bolt for precise and easy adjustments. Probably you should be looking at GRX-810 or 815 FD for this build - will allow you to run the 48-31T option they recommend.
