It might be a little late for a reply, but I've had my jamis durango for about a month. I haven't done anything to it that would have really "tested" the bike out. Honestly though, I'm not skilled enough or experienced enough of a rider to tell you if the frame is strong or not. Some of the parts of the durango I bought I feel need replacing though just because I'm not liking the feel as much. I haven't done anything but ride on the streets, so maybe the bike isn't set up for dropping off small flights of stairs. I think the frame is fine for light riding though. It looks strong enough for me.
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