Wide link shadow design dyna sys 10 speed top normal deore rear derailleur shadow plus features a super low profile design that reduces the risk of damage from trail side hazardsshadow plus uses a chain stabilising switch that when on will reduce chain bounce in rough terraindirect 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 suspen