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  1. #1
    Senior Member long john's Avatar
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    rack tubing bending

    what tubing jigs are you all using for racks. what is the common tube size for racks.
    i am looking at the klien tools tubing bender from home depot. is this tool ok .

  2. #2
    Randomhead
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    Here are my tubing notes
    Rack tubes
    1/4 x .028 handlebar racks
    3/8 x .035 Porteur and rear
    some people use 5/16 instead of 3/8 for connecting bars.

    Stem tubes
    .065 and bore it out to a perfect fit for the steerer.
    1.375" .058 for 31.8 bars
    1.125" .058 for 25.4 bars
    1.125" .049 for 26.0 bars
    stems 90 - 100 mm for under 150lb riders . I use 1.125" .035
    stems 105 - 120mm all weights 1.125" .049
    all 1" ext stems get .049
    all lugged stems get .035 ext. I turn the material for the lugs to .035 thick from either .065 (that has been bored) or .058.

    frame tubes
    1 1/4 x .058

    Mixte tubes
    1/2 x .035

    People I know seem to be happier with the tubing from Aircraft Spruce. Dillsburg is cheaper for a reason, unfortunately. The stuff I got from Dillsburg is ok, but I know people that have gotten tubes with horrible surface finish from them. You don't notice until you clean off the tube either, because it's covered in grime.

  3. #3
    Senior Member mudboy's Avatar
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    Any idea how many feet of tubing go into a Blackburn-style rear rack? A rack is my next project and I'd like to know approximately how much to order.
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  4. #4
    Randomhead
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    I'm just building my first racks now, so I don't know. I'm estimating 10, but take that with a grain of salt. If you really don't want to buy extra, you can draw it out. The corners don't really take up much more than just going straight.

  5. #5
    Framebuilder
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    Agreed, 10 is spot on. Of course that assumes you plan well and put all your bends in the right spot (without crimping) on the first try.

  6. #6
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    The racks I make suck up 20 feet, but they are expedition weight. generally the preferred tubing bender is the Rigid, older model.

    This is pricey, but would probably be worth it for a lot of bends:

    http://www.aircraftspruce.com/catalo...rtypebendr.php



    I use one of these:

    http://www.princessauto.com/workshop...l-metal-bender

    I bought it on sale. I don't use the pictured dies, I substituted 2 machinery type pulleys. I filled them in with epoxy using a Popsicle stick. Perfect 3/8" radius. Later I turned rollers for it out of steel.

  7. #7
    Randomhead
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    the aircraft spruce link goes to benders that look like the Imperial/Gould benders. These are ok, and are easily found on ebay

  8. #8
    Senior Member mudboy's Avatar
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    I wonder if this would work for a beginner?
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  9. #9
    Randomhead
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    I have one of those. It works ok on .028 1/4". I'm afraid to use it on anything else though.

  10. #10
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    As Unterhausen said the Harbor Freight one works well on 1/4 .028, I tried it on 3/8, but can't remember the wall thickness, anyway, I snapped it trying to bend the 3/8 tubing.

  11. #11
    Randomhead
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    I'm doing a happy dance because I just won a Rigid bender on the 'bay. I'm not telling you what I really want, they already cost too much for me to afford right now.

  12. #12
    Senior Member mudboy's Avatar
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    Unterhausen, which model number did you get?
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