Both the rear dropouts are replaceable on the Edit and the Bitmap. Its one of those little extra touches that we think are important. It's particularly important to have a replaceable mech hanger because your fancy new clutch mech hangs off the side of the bike where it's vulnerable to rock-strike. If that happens, you don't want your mech to snap or your frame to be damaged. Much better to replace the dropout, which is designed specifically for that purpose. This dropout is compatible with a Rockshox Maxle rear axle and is good for any Edit (v1, v2, v3) or Bitmap frame.