10-4 on that. I'm not sure that the derailure isn't out of spec itself. One hinge point seems wobbly compared to an old Acera I have. I'll replace the hanger but thought why not go with the best rear derailleur I can get if this stuff works like I think it does? Great ,ultra reliable shifting is all I really need in the way of upgrades. I could get a new Tourney and try it but the extra isn't much if the Deore XT will work a lot better. I wouldn't drop several hundred in upgrades to this bike but I got it used for $200 and I don't really need anything else for a while.