Shimano ultegra r8050 di2 11sp rear derailleurready to complete your shimano ultegra di2 electronic drivetrain or to replace your component after a crash, the slick shifting ultegra r8050 di2 rear derailleur now performs better than ever'. '.strtoupper('b')y incorporating shimanos tried and tested ldquoshadowrdquo technology from its mountain bike mtb components, this road bike rear derailleur has enhanced shifting stability'. '.strtoupper('t')his is thanks to the revised lower profile design and a cage that sits closer to the bikes frame'. '.strtoupper('a')n added benefit of this is better aerodynamics and a sleeker, more integrated look.compact rear mechanismthe optimised slant angle of the ultegra r8050 di2 11sp rear derailleur guarantees race endurance and is more compact in design'. '.strtoupper('t')he closer fit to the frame also ensures it suffers less damage in the event of a crash.featuresmaterial alloycolour greyspeed 11 speedmounting standard hanger type mount or direct mountcompatibility 11 speed shimano di2 road shifters, 11 speed road cassettescage sizeseparate short and medium cage size optionscassette size capacity short cage 11 25t to 11 30t medium cage 11 28t to 11 34ttotal capacity short cage 33t medium cage 37tclutch type noshadow technologyprecise and accurate shiftingoptimised slant anglelow profile designmanufacturer reference codes short cage rdr8050ss medium cage rdr8050gsweight short cage 240g medium cage 247gtechnologiesshadow rd traditional derailleurs extend wider than the profile of your bike'. '.strtoupper('w')ith its low profile design, shadow rear derailleurs have a more compact shape that fits closer to the frame, with more direct cable routing'. '.strtoupper('t')hey also maintain a consistent distance to the cassette for increased shift stability'. '.strtoupper('t')he reduced body width creates a sleek and smooth appearance, ensuring less damage in a crashdi2 the power and precision of di2 are unmatched'. '.strtoupper('i')t enables beautifully smooth shifting both front and rear'. '.strtoupper('t')he lack of maintenance and adjustment is impressive once youve customised your di2 to shift to your preferences, it will continue to do so endlesslya 2 year warranty is offered with all shimano products from chain reaction cycles 3 years on dura ace and xtr products.buy shimano components from chain reaction cycles, the world's largest online bike store.