Shimano Deore M615 Shadow Plus Rear Derailleur: The Deore Shadow Plus features a super low profile design that reduces the risk of damage from trail side hazards with the Shadow Plus chain stabilising switch that when on will reduce chain bounce in rough terrain. The derailleur is Direct Mount compatible which 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 & move suspension pivots. With the Single tension spring preventing contact with the chainstay & the Shadow Plus chain stabilising switch all this leads to a silent ride. Shadow Plus features a super low profile design that reduces the risk of damage Shadow Plus uses a chain stabilising switch that when on will reduce chain bounce Wide link Shadow design Dyna-Sys 10-speed top normal Deore rear derailleur Direct cable routing prevents snagging from any trail side hazards Alloy & steel construction leads to lower weight without compromising strength & durability Direct Mount compatible Rear Derailleur system Single tension spring prevents contact with the chainstay resulting in a silent ride Wide link design increases rigidity & 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 10-speed compatible only Compatible with 32-36T low sprocket