The newly developed Ultegra derailleurs, with its new tension arm a shorter actuation on the lever and thus a more direct and barge switching. Furthermore, the force is more evenly over the entire area.
Hence the ratio at Shiftbrakelever ST-6800 could be changed. The front derailleur is adjusted by the modified chain guide even at the larger ratio coverage of the Ultegra crank.
Ultegra derailleur FD-6800 is only compatible with switching brake levers of the new 11-speed groups.
Design: Mounting by clamp or braze
Compatibility frame: seat tube diameter 28.6 / 31.8 / 34.9 mm
Compatibility Gear: 11-speed Shimano Dual Pull ST-R9100, R9120-ST, ST-9000, ST-9001, ST-6800, ST-5800
chain line : 43.5 mm
Chainstays angle: 61 ° -66 °
chainring: 46-53 teeth
Capacity: 2-fold with 16 teeth difference between the largest and smallest sheet
compatible chains: HG-EV 11-speed / HG-X11