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The Shimano Altus RD-M2000 rear derailleur features Shimano Shadow RD design and wider linkage that ensures durability and precise shifting.Shimano Shadow RD derailleurs have a super low profile design and single tension construction so that they do not hit the chainstay in rough riding conditionsWider linkage ensures durability and more precise shiftingB-tension spring allows for quick and easy wheel installation and removalItem SpecificationsRear Derailleur Mount Type10x1 StandardRear Derailleur Mount TypeShimano Rear Direct MountRear Der/Shifter CompatibilityShimano MountainCage LengthLongDrivetrain Speeds9ColorBlackChain Wrap Capacity (teeth)45Largest Cog36