From Shimano's new Ultegra R8000 series that takes almost all the best from their Dura Ace series in a more affordable price package.

The rear derailleur is made as a Shadow version that provides even greater stability in the gear shift, as well as less risk of damaging the rear derailleur in the event of a crash.

With long arm.

Can take between 28-34 teeth as the largest gear wheel on the cassette for smaller teeth, the SS version is selected.