The Chain Keeper was not designed to work with 142×12. However, we have tested it on an Ibis Mojo HDR, which uses a 142×12 rear axle setup (Maxle standard), and found that the Chain Keeper will works if installed backwards (QR lever inside the frame). This requires that the skewer be partially dissembled so the axle can be passed through the dropout but works quite well considering it wasn’t designed specifically for use in a 12×142 dropout. We also found it easier to pull the chain onto the Chain Keeper after the Chain Keeper is installed (instead of during installation). Check out the photos below.