I also use different manufacturers for lightweight steel brake discs (Eg. Shift/Brake Levers ST-R9270. Rear Derailleur RD-R9250. ).
Shimano Di2 Dura Ace R9270 (R9250) Mini Groupset
Shimano Di2 TL-EW300 E-tube Di2 plug tool 105 Ultegra Dura Ace
Shimano Di2 Full Cable Set With Battery And Junction Boxes. Dura Ace/Ultegra
Shimano R9250 Dura Ace Di2 Front Derailleur 12-Speed
BXT Carbon Road Bike Shimano DI2 R7170/R8170 /R9270 DI2 Electric Disc Road Bike
Shimano Di2 SM-PCE02 PC interface for E-tube SEIS Di2 SD50 and SD300 PC Cable
