Tough aggressive and light weight dyna sys11 11 speed slx rear derailleur using revolutionary features from xt and xtr at an affordable price point shimanos 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 axel sizes and move suspension pivots shadow dyna sys11 11 speed rear derailleur delivers reliable and precise shifting with a stiff and ligh