The SramGX Eagle rear derailleur is by far themostcommon 12 speed rear mech of any brand we see and we're not surprised. It's a reliabledesignthat gives riders smooth, unfaltering shifting performance day in day out. Combine this with a very reasonable cost and the GX rear derailleur is our go to for most mountain bikers.
Compatible with all Eagle cable units
10-50T and 10-52T options, 10-52 is backwards compatible and will work with 10-50T cassettes