We need help trying to figure out why our derailers keeps getting torn off. Heres the low down .. Kona Stinky... on drops or just recently dirt jumping . The chain seems to be slacking (guess on the slacking) and ends up behide first gear, ounce this happens wheel locks and the derailer is simply torn off. Tension on the chain seems ok. Last derailer was a long cage .. not sure if this could add to the problem. We put a front guide (single ring) on the bike to keep everything square. We were thinking the chain was droping up front then causing the havac in the back. Any ideas?