Shimano deore m593 shadow 10 speed rear mechshimanos deore m593 shadow 10 speed rear mech features high end technology to provide crisp clean and responsive shifting every time with a new low profile design to minimise damage when on the trails this deore shadow rear mech is also strong and durable the fluorine coated bushings ensure that your rear mech produces minimal friction for a consistently smooth performance whilst the single tension spring works in tandem for a quiet ride feature