Dyna-Sys —Next generation 10s drive-train optimized for modern MTB. New options of the Dyna-Sys 10s drive-train for the Deore XT lineup. Dyna-Sys does not deliver only 10s drive-train to MTB, but also a dynamic power transfer and the newest system with optimized stability. DEORE XT Rear Derailleur’s, available in GS and SGS version. Features: • Series: DEORE XT • Shifting Action: Top Normal SHADOW • Maximum Sprocket: 36T • Minimum Sprocket: 11T • Front Difference: 18T • Total Capacity: GS 35T Our Best Selling Shim