Wide link shadow design dyna sys 10 speed top normal deore rear derailleur'. '.strtoupper('s')hadow plus features a super low profile design that reduces the risk of damage from trail side hazards'. '.strtoupper('s')hadow plus uses a chain stabilising switch that when on will reduce chain bounce in rough terrain direct mount compatible rear derailleur system gives more space around the rear frame dropout resulting in easier rear wheel removal but also allows frame designers to shorten chain stays increase axle sizes and move suspension pivots single tension spring prevents contact with the chainstay resulting in a silent ride direct cable routing prevents snagging from any trail side hazards alloy and steel construction leads to lower weight without compromising strength and durability wide link design increases rigidity and service life top normal return spring lends to incredibly intuitive operation when combined with rapidfire shifters large 11 tooth pulleys are used for longer life two fluorine coated link bushings for low friction operation dyna sys hg x 10 speed compatible only compatible with 42t low sprocket