As fietsbob notes both of the bicycles that broke above the crank had a brazed on fitting just where the break occured and the bicycles both had a very long chrome moly seatpost that was also inserted quite a ways into the seatpost. Both bicycle frames were steel so both were repaired. I weigh 240lbs and find that my bicycles will show stress on the seatpost/seatstay junction. I run my posts out about 10" but with my weight it can cause issues in this area and I keep a watchful eye on that part of my frames. Every couple of months I will give my bicycles an overall frame/fork inspection and I always look for signs of frame breaks and distortions. My bikes all have steel frames. My wife rides an aluminum Trek 7100 and I inspect it also.