Originally Posted by
ClydeClydeson
I've seen this type of failure quite a few times, and seen a handful of repair attempts. Any welded repair will not likely finish the ride home from the welding shop.
Again, to be clear, I probably wouldn’t fix this bike. However, I broke the seat mast on a bike like this one at where the arrow is pointing.
The area is unsupported and broke because of a seatpost with massive setback (a Titec Hellbent post with 1.5” of offset). A machinist friend at work welded it and it lasted for many years…and I’m not a light guy. I didn’t use the Hellbent post again, however. The machinist is a master welder whose had no problem with doing the weld and wasn’t concerned about it failing. It certainly lasted more “than the ride home from the welding shop”.
It would be better to get a new frame…and probably cost just about as much…but welding would hold up for quite a while even for aluminum.