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Giving that old commuter or hardtail mountain bike a refresh? The Shimano Altus RD-M2000 9-Speed Rear Derailleur will blow your mind with how well it shifts. It's a testament to Shimano that they continue to improve every one of their products, even if that product's not at the sharp end of development. Your 9-speed cassette has never shifted this well!
New Shadow Design with Optimized Slant Angle – Lowers shift effort while improving shifting and driving stability.
Stronger Return Spring for Crisp Shift Feeling
Rear Derailleur / Shifter Compatibility – All Shimano 9-Speed HG Cassettes, 9-Speed Mountain Shifters, and 9-Speed Chains.
Smallest Cog – 11T
Largest Cog – 36T