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.

Short arm.

Can take up to 30 teeth as the largest gear wheel on the cassette for several teeth, the GS version is selected.