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Shimano Ultegra CS R8100 11 30 12 speed Batavus After treatment for non metals parts: Assembly flat surface After treatment for non metals parts: antibacterial and very stable Product specifications Model: CS R8100 12 Series: Ultegra R8100 Series Average weight: 291 (11 30t) 345 (11 34T) Combination: 11 12 13 14 15 16 17 19 21 24 27 30t 11 12 13 14 15 17 19 21 24 27 30 34T Combination name (group name): 11 30t 11 34T Type: Hyperglide + Compatible chain: HG 12 speed Gears Back: 12 Aluminum leaf_: 0 Aluminum spinarm_thal (st ): 2 Spline Type_HG Spline L2 (Road 12 speed dedicated): yes steel leaf_ number (st
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