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Sram GX Eagle Rear mech 1 x 12 Speed – Black | eBay £83.70

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This new GX derailleur not only answers the Eagle drivetrain’s need for greater capacity, but it’s also the next evolution of our proven, 1x-specific X-HORIZON design. The larger, 14-tooth X-SYNC lower pulley allows 10- to 50-tooth cassette, and also adds to Eagle’s overall smooth-pedaling feel. 

GX Eagle Groupset 1×12 Speed – 170mm Crank 10-50t XD Cassette | eBay £349.99

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The SRAM Eagle drivetrains are the newest edition to the SRAM line up and they are the only 1x drivetrains that are fully system engineered for optimal performance.

If weight is a consideration but you want a high level, reliable performance to go with the minimal weight then the GX Eagle drivetrain is the one for you.more: