SRAM X1 Type 2.1, 11sp Rear Derailleur, Medium Cage, Black

BTI part #: GS2579 vendor part #: 00.7518.070.000 UPC: 710845764028 model: X1 Type 2.1 mount: 10x1 Standard speed: 11sp cage: medium retention: clutch min/max: 10/42t capacity: 32t weight: 256g color: black    I N F O Vendor part number change (10/01/14) was 00.7518.046.000   X-Actuation ratio specifically engineered for SRAM's 1x11-speed mountain drivetrain X-Horizon design aligns the parallelogram to a horizontal axis providing constant chain gap across all 11 gears resulting in fast, precise shifts with reduced shifter force Type-2 (T2): self lubricating, roller bearing clutch mechanism provides one-way friction damping to cage improving chain stability and reducing chain-slap/noise, with an incorporated CageLock feature for faster wheel changes and chain service X-Sync 12-tooth pulley design reduces noise and maximizes chain control by alternating wide/narrow teeth to mirror chain profile, while upper pulley offset maintains chain gap to cassette Forged aluminum links, B-knuckle, and inner cage with an aluminum outer cage

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