This wide link design Shimano Deore M615 10-speed Shadow Plus Rear Derailleur is super low design & direct cable routing that reduces risk of damage from knocking into something or snagging on something on a trail. It's alloy & steel construction brings down the weight without compromising strength & durability. On the Shadow Plus derailleurs Shimano have designed a chain stabilising switch that reduces chain bounce in through terrain & help stop you dropping your chain. The Direct Mount compatible derailleur gives more space around the rear frame dropout resulting in easier rear wheel removal but also allows frame designers to shorten chain stays, increase axel sizes & move suspension pivots. The single tension spring prevents contact with the chainstays resulting in a silent ride, while the top normal return spring gives you an incredibly instinctive operation during single & rapid-fire shifting. Available to 2 colour options, silver & black with 2 size options SGS (long cage) for triple chainset & GS (medium) for double & single chainsets.