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  1. #1
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    Newsboy style toptube?

    Anybody knows what type of tube bender or method used to get the nice gentle bend in topstubes like on the Merlin newsboy, Retrotec etc?
    Thanks

  2. #2
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    Tube bending mandral

    This has a 2' radius and the tube is 1.125" x .035" 4130 packed with very fine sandstone sand from the banks of the mighty Mississippi.

    Tube Bender 5.JPG

    I used this tube for a ST but it is the same type of bend.

    114_1432.JPG

    -Joel
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  3. #3
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    Joel.....can you please tell me what CC and SS you used with those dropouts? I have had a hard time using that type of DO due to the "plug" config. Thanks.......
    [SIZE=2][SIZE=3]"Roll your own......." [SIZE=1]Smokebikes.com[/SIZE][/SIZE][/SIZE]

  4. #4
    what, no trials?
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    What seatpost fits in a 1.125x.35?

  5. #5
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    1.125" = 28.6mm
    .035" = .9mm
    28.6 - 1.8 = 26.8mm seatpost

  6. #6
    Witty McWitterson
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    Time for my first 'duh' question - is the tube packed with sand to prevent crimping/creasing whilst bending?
    Just a regular guy.

  7. #7
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    Yes.

    -Joel
    NOTHING WORKS LIKE CLOCKWORK

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  8. #8
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    Quote Originally Posted by Clockwork Bikes
    This has a 2' radius and the tube is 1.125" x .035" 4130 packed with very fine sandstone sand from the banks of the mighty Mississippi.

    [
    -Joel
    That's how this one was done "Garro Style"!
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  9. #9
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    Quote Originally Posted by gabe
    Joel.....can you please tell me what CC and SS you used with those dropouts? I have had a hard time using that type of DO due to the "plug" config. Thanks.......
    Those are pretty standard 16mm SS and probably a 30x16 CS. You'll need to shorten the stays untill the end is big enough to fit the plug.

    -Joel
    Last edited by Clockwork Bikes; 01-29-2008 at 12:49 PM.
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  10. #10
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    Also, there are two configurations of these drops out there. The ones from Nova have an angle that is way tight and the ones from Ceeway are more "user friendly".

  11. #11
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    Quote Originally Posted by Syltmunk
    Anybody knows what type of tube bender or method used to get the nice gentle bend in topstubes like on the Merlin newsboy, Retrotec etc?
    Thanks
    i'm sure glad joel and livewire have it down now so now i don't have to awnser all the "how-to" bending questions! steve.
    steve garro el jefe/el solo. coconino cycles www.coconinocycles.com www.coconinocycles.blogspot.com

  12. #12
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    Are you cold bending those sand packed tubes? The way we bend racecar stuff is with heat and sand but the SAND MUST BE DRY or you create a pipe bomb!

  13. #13
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    Quote Originally Posted by surlytman
    Are you cold bending those sand packed tubes? The way we bend racecar stuff is with heat and sand but the SAND MUST BE DRY or you create a pipe bomb!
    Definetly no heat needed.

    -Joel
    NOTHING WORKS LIKE CLOCKWORK

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  14. #14
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    Quote Originally Posted by Clockwork Bikes
    Definetly no heat needed.

    -Joel
    Cool, I would hate for someone to see a thread like this and blow their face off! I too have bent tubing dry. Cool thread

  15. #15
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    Quote Originally Posted by surlytman
    Are you cold bending those sand packed tubes? The way we bend racecar stuff is with heat and sand but the SAND MUST BE DRY or you create a pipe bomb!
    What kind of racecars are you making? I've been involved in building cars from single seat open wheel racers to stage rally cars, and we always bend tubing cold.

    To answer the original question, I would (and do) use this type of machine:


  16. #16
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    Quote Originally Posted by Live Wire
    Also, there are two configurations of these drops out there. The ones from Nova have an angle that is way tight and the ones from Ceeway are more "user friendly".
    Yeah, the Ceeway one is the Long Shen track bike dropout that is made for more road-bike style frames. The one at Nova is modified version that was originally made for VooDoo for their singlespeed mountain bike, so the angle is much tighter.

  17. #17
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    Quote Originally Posted by Clockwork Bikes
    This has a 2' radius and the tube is 1.125" x .035" 4130 packed with very fine sandstone sand from the banks of the mighty Mississippi.

    Tube Bender 5.JPG

    I used this tube for a ST but it is the same type of bend.

    114_1432.JPG

    -Joel
    Gotta say I'm impressed. I would guess that .035 wall would be wrinkle city, sand or no sand. I'm still getting very slight rippling (can feel it but not see it) in my 7/8" ti .035 filled with cerro bend around a 11" radius. I definitely want to take a shot at a 35mm .035 tube in the next month or two. Scared.
    Sean Chaney :: Owner/Builder :: Vertigo Cycles LLC
    flickr :: www.vertigocycles.com

  18. #18
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    Gracias...........
    [SIZE=2][SIZE=3]"Roll your own......." [SIZE=1]Smokebikes.com[/SIZE][/SIZE][/SIZE]

  19. #19
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    Quote Originally Posted by RoyDean
    What kind of racecars are you making? I've been involved in building cars from single seat open wheel racers to stage rally cars, and we always bend tubing cold.

    To answer the original question, I would (and do) use this type of machine:

    Maily hotrod stuff now, but that is How Kent Fuller bent up all his FED front axles and such. Still is a good technique for many apps, weird header bends etc. Use a hausfelt hydro for most things tho......

    Sorry to hijack.

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