The shimano deore m615 10 speed rear derailleur shadow design a wide link shadow design dyna sys 10 speed top normal deore rear derailleur the shadow plus features a super low profile design that reduces the risk of damage from trail side hazards the shadow 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 als