The electronic Shimano Ultegra Di2 RD-R8050 rear derailleur is characterised by its particularly low profile, known as Shadow Design, which not only provides a compact appearance, but also more stability and less risk of damage. This guarantees quiet, safe shifting operations under all circumstances. Shifting takes place effortlessly as is usual with Di2. You can also use the Synchro Shift function, which allows the front derailleur to adjust automatically, or the Semi Synchro Shift function. This causes the rear derailleur to shift accordingly when the front derailleur is operated. The new direct mount option is also perfect for frames with thru axle dropouts. The Ultegra Di2 rear derailleur...
Best Price: £259.99 from Leisure Lakes Bikes