With Di2 technology shifting is easy and precise – just a light touch, as soft as a mouse click, is sufficient for the rear derailleur to instantaneously select the correct gear and the 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 11 Speed Rear Derailleur Rear Derailleurs – £139.99 (RRP – £)
