I have a GT DHI TEAM and even with the MRP chain guide the chain comes off the front chain ring when the suspension is in full load. The local bike shop, who are really good. adjusted the tension on the rear derailer and said it was the problem . Now I don't doubt them but I asked if the chain needs replacing and they said no. The teeth on the front chainring are not bent or worn down and the rear derailer is not bent all the teeth are fine . Now my question is. " Is this adjustment a sign of a stretched chain or a is it some other problem that is not yet surfaced enough to show itself. ie; bent rear trianle, or something along that line?" Please help and I am only in my second year in MTB, so there is allot I don't know yet and want to learn about how to fix them.