Originally Posted by pinnah
Me? I'm guessing that steed got rode into the ground while being fully loaded.
The 720s of that era with their combination of thin walled 531 (relative to 022 and 501) and super long chainstays were known for bad sway and stability problems. Just too much distance for such light tubing.
My guess is that bike got ridden:
a) by a heavy rider
b) on rough roads or worse
c) with heavy loads on a rear rack
d) all of the above
They are really quite unique bikes, especially in the non-canti versions. I can't think of another bike with those 47cm stays.
I know for a fact that the original owner never did take it on tour. It pretty much remained a dust-gathering dream for him.
I do agree with you that the extra length is probably what did in these monsters. I don't believe the extra-length tubing was properly tested before they put it to production. The performance of the frame is superb though, even with it's existing crack.
A) I'll vouch for that, fellow was on the heavy side as I.
B) Possibly - Miami has never been known for good roads.
C) I don't think this machine ever carried anything but a rider.
Unquestionably, second to the ride, the long stays are my favorite feature of the 72X series. Without them, it would just be 'simply another 531 frame.'
I'm considering using a slightly thicker tubeset for the seat stays when I
do get around to having this machine re-done (not anytime soon), along with considerably more braze around the rear brake bridge.
Take care,
-Kurt