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Bending frame rails on bike possible?

Discussion in 'The Garage' started by Petew, Jul 25, 2017.

  1. Petew

    Petew XS400 True Believer Top Contributor

    I am preparing another frame for my next project. I would like to use a solo saddle and drop the top rails a bit to form a "bucket shape" or slope the rails below the tank. I have seen this done by cutting and rotating the top rails and sectioning the frame rails below the shock mounts. Is there a way to bend the top rails to a light radius that might be done without using a welder, just by heating the tubes? I don't have access to a welder and would like to do as much of this build by myself as I can. The area I mention is shown by the yellow arrows, the top rails will be cut in the area of the red lines.

    Attached Files:

  2. 16VGTIDave

    16VGTIDave XS400 Guru Top Contributor

    You would have to cut the tubes, pack them with dry sand (wet sand will create steam and possibly explode), cap the ends and then heat the tubes red hot with a large tip on an oxy-acetalyne torch. Then, while still red hot, you could bend the tubes without them crimping or crushing. Not the easiest thing to do. This is why people cut out and weld in loops, hoops, etc.
  3. Petew

    Petew XS400 True Believer Top Contributor

    I kind of expected that answer seeing as no one has a thread about doing it. I may just have to redirect my thoughts to a different style. Thanks for your input Dave.
  4. kshansen

    kshansen XS400 Addict

    Also don't forget that if you do somehow bend the tubes they are now going to be a bit shorter.
  5. Ethanl

    Ethanl XS400 Enthusiast

    someone here did a bike like that it was a white/cream color old thread but a good read it was a shop bike cant remember the tread name though
  6. Ethanl

    Ethanl XS400 Enthusiast

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