Di2 compatible. Low-profile Shadow design construction reduces risk of damage in a crash. Programmed automatic motion. Quick, smooth and effortless to shift. The removal of traditional mechanical cables eliminates corrosion and stretching. Derailleur contains a saver (fuse) function protecting from strong impacts. High tolerance cold forged aluminium link plates and body construction. Four self-lubricating micro-machined fluorine-coated link pivot bushings provide low-friction shifting. 11-speed E-tube Di2 compatible. Wide gear ratio compatible with 11-25 up to 11-30T.