The shimano deore m610 10 speed rear mech derailleur a wide link shadow design dyna sys 10 speed top normal deore rear derailleur 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 shimano deore m610 10 speed rear mech derailleur features shadow features a super low profile design that reduces the