Join Date: Mar 2006
Location: Quad Cities, Iowa
Bikes: Schwinn Traveler Fixie, Fuji Berkley commuter, Specialized Sirrus road rig, ++ many more
Repairing a Steel Frame
I got a GT mountain bike frame (4130 CrMo, i think) for parts. The rear triangle was run over at some point and both seatstays/chainstays were smushed together. After stripping the bike and letting it sit for a few months, i remembered about the amazing forgiveness of steel.
I took an extra 2x2 i had from a previous art project, and cold set the rear triangle, bending the stays back into place. Without the proper frame alignment tools, the rear triangle looks pretty straight. I "adjusted" the derailleur hanger too, as that had been bent. So far, things look decent. There are some scratches and paint damage, but over all, it looks cosmetic.
The Theory vs. Practice:
Would the frame, obviously bent and then rebent, be strong enough to ride? I cannot imagine it is as a strong as it formerly was, but would it standup to a year or two of riding? Or would the stresses have weakened the steel frame too much? If it can be ridden, what are the limitations? Streets only? A little rough stuff? Any rough stuff?
So far, i have not dumped any money into, and the build plan is to use stuff from my parts bin and get inexpensive parts when need be. Would the frame collapse after one use, or is there a good chance it could be ridden again?
If this is in the wrong subforum (mountain bikes? alt bikes? utility?) please let me know and i'll remedy the situation. Thanks in advance for any and all help/input/advice!