Sram GX Eagle 12 Speed Rear Derailleur has now become a riders favourite. Matched up with a Sram Eagle 10t to 52t Cassette this will give you huge gear range to climb some of the steepest hills here in the Tweed Valley.
Sram uses some of same technology used in the XX1 and X01 versions of the Eagle Derailleur family to give the great smooth and precise shifting that Sram is known for.