The biggest difference you will notice is just how much quicker and effortlessly smoother shifting on the front chainrings even under load, the effort and time to actuate the shift between mechanical and Di2 is truly staggering. With the removal of traditional mechanical cables in favour of electrical wires not only eliminates poor shifting caused by contaminates, corrosion and stretching, but provides effortless gear shifts….
– Shimano Ultegra 6870 Di2 Braze-on Double Front Derailleur Front Derailleurs – £126.99 (RRP – £)
