Clutch MTB has created a clamp-on ISCG05 adapter that makes up for the lack of chainguide tabs on certain Giant trail bike models. It fits Giant Reign, Anthem, Anthem X, Trance and Reign. It does not fit Trance X due to the frame's carbon construction. They're checking fitting on Anthem 29er (which should work) and the cost is $39.
2013 Products from Interbike 2012, Part 1 0 of 14