Advertise on Bikeforums.net



User Tag List

Results 1 to 20 of 20
  1. #1
    The Recumbent Quant cplager's Avatar
    Join Date
    Jan 2012
    Location
    Norwalk, CT
    My Bikes
    2012 Cruzbike Sofrider, 2013 Cruzigami Mantis
    Posts
    2,799
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)

    Downtube folding mechanism hardware missing. Advice?

    Hi,

    I have a Downtube 9 that is missing the folding mechanism hardware.

    * Does anybody know where to get new hardware?

    * Can somebody post a few pictures of what the hardware looks like from a few different angles (both open and locked)?

    Thanks,
    Charles

    p.s. I'm missing the same for the handlebar stem, but if I can't figure that out, it will just be replaced. If people know how to fix that easily as well, that would be helpful.
    http://Charles.Plager.net
    http://RecumbentQuant.blogspot.com

  2. #2
    Senior Member
    Join Date
    May 2004
    Location
    Pacific Northwest
    My Bikes
    Too many....................
    Posts
    3,064
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I would get hold of Yan at Downtube.
    http://www.downtube.com/
    Dahon Jifo
    Dawes Kingpin 2speed

  3. #3
    The Recumbent Quant cplager's Avatar
    Join Date
    Jan 2012
    Location
    Norwalk, CT
    My Bikes
    2012 Cruzbike Sofrider, 2013 Cruzigami Mantis
    Posts
    2,799
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Dynocoaster View Post
    I would get hold of Yan at Downtube.
    http://www.downtube.com/
    I sent him an email before posting; hopefully that works out for me. My friend from whom I acquired the bike has tried in the past and didn't have much luck.

    Cheers,
    Charles
    http://Charles.Plager.net
    http://RecumbentQuant.blogspot.com

  4. #4
    Senior Member
    Join Date
    May 2004
    Location
    Pacific Northwest
    My Bikes
    Too many....................
    Posts
    3,064
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Dahon Jifo
    Dawes Kingpin 2speed

  5. #5
    The Recumbent Quant cplager's Avatar
    Join Date
    Jan 2012
    Location
    Norwalk, CT
    My Bikes
    2012 Cruzbike Sofrider, 2013 Cruzigami Mantis
    Posts
    2,799
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Dynocoaster View Post
    Thanks Dynocaster.

    For what it's worth, that stem looks identical to one I have on a Greenzone folding bike. The one I have on my bike did not last well and I wouldn't recommend it. (I can't say for certain it is the same, but it very much looks like it).

    For my purposes, I don't mind replacing the stem with a non-foldable one. But I do kinda need the bike to not fold when I'm trying to ride it.

    Cheers,
    Charles
    http://Charles.Plager.net
    http://RecumbentQuant.blogspot.com

  6. #6
    Senior Member
    Join Date
    Apr 2006
    Posts
    2,152
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    I have some ideas but without a picture of the fold/hinge area I don't know it they would work or not. Please post a picture of the frame of your bike. Specifically the hinge area. Roger

  7. #7
    The Recumbent Quant cplager's Avatar
    Join Date
    Jan 2012
    Location
    Norwalk, CT
    My Bikes
    2012 Cruzbike Sofrider, 2013 Cruzigami Mantis
    Posts
    2,799
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Hi,

    I talked to Downtube today. The frame hinge is $50 (including shipping). On the one hand, it seems a little steep, but since the bike doesn't work without it, I ordered it. They don't replace the the pieces for the folding stem, but sell a new folding stem for $50. I'll be replacing this piece, but I thought I 'd mention it for any others who happen across this in the future.

    @Roger: Thanks! I'll be taking pictures when I install the hinge, so you can have an idea if your ideas would work or not. As I said, $50 seems a little steep and if others want to try something more home grown in the future, I think it could be done more cheaply and still be safe/functional.

    Cheers,
    Charles
    http://Charles.Plager.net
    http://RecumbentQuant.blogspot.com

  8. #8
    Senior Member
    Join Date
    Apr 2006
    Posts
    2,152
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Of the $50 they probably pay lawyers 60% of it for liability reasons. If that part breaks "Houston we have a problem." The same is true for the stem. Roger

  9. #9
    The Recumbent Quant cplager's Avatar
    Join Date
    Jan 2012
    Location
    Norwalk, CT
    My Bikes
    2012 Cruzbike Sofrider, 2013 Cruzigami Mantis
    Posts
    2,799
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    I got the hardware today, but as far as I can tell, it looks to be too small (can anybody confirm that not all Downtube bikes have the same hardware here?)

    The closing mechanism is basically a solid cylinder where one end has a little bit of material removed so that it has a smaller radius. My understanding (there were no instructions sent with the hardware) is that the end with the smaller radius is supposed to point down and that when closed the smaller radius is supposed to engage the other side of the frame.

    When I attach the quick release bolt, the cylinder is constrained so that nothing will appear out of the bottom and so that nothing will engage the other side of the frame. I believe this means that they sent me the wrong size.

    Any insight from people with Downtube bicycles?

    Thanks!
    Charles
    http://Charles.Plager.net
    http://RecumbentQuant.blogspot.com

  10. #10
    Junior Member
    Join Date
    Oct 2009
    Location
    Dunedin Florida
    My Bikes
    'Downtube Nova' folder
    Posts
    24
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I'm not sure if my Nova has the same folding clamp as your #9, but here's some photos of the clamp on my Downtube Nova.

    Charlie
    Attached Images Attached Images

  11. #11
    Senior Member
    Join Date
    Apr 2006
    Posts
    2,152
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Again I am not sure why you are asking us here without pictures. Contact the people/person who sent you the part. If you didn't give them a picture of the bike it is very possible you got the wrong part. If you are installing it wrong they can probably help with that also. Roger

  12. #12
    The Recumbent Quant cplager's Avatar
    Join Date
    Jan 2012
    Location
    Norwalk, CT
    My Bikes
    2012 Cruzbike Sofrider, 2013 Cruzigami Mantis
    Posts
    2,799
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by cbinfl View Post
    I'm not sure if my Nova has the same folding clamp as your #9, but here's some photos of the clamp on my Downtube Nova.

    Charlie
    Very interesting. This is completely different than what is on my bike. Thanks for the pictures!

    Charles
    http://Charles.Plager.net
    http://RecumbentQuant.blogspot.com

  13. #13
    The Recumbent Quant cplager's Avatar
    Join Date
    Jan 2012
    Location
    Norwalk, CT
    My Bikes
    2012 Cruzbike Sofrider, 2013 Cruzigami Mantis
    Posts
    2,799
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by rhenning View Post
    Again I am not sure why you are asking us here without pictures. Contact the people/person who sent you the part. If you didn't give them a picture of the bike it is very possible you got the wrong part. If you are installing it wrong they can probably help with that also. Roger
    I don't completely disagree, except that my hope was that (1) I could get confirmation that not all Downtubes use the same hardware (which Charlie provided very nicely) and (2) that somebody with a Downtube would find my description sufficient (I was planning on taking pictures and adding them after the fact but Sandy decided otherwise for me ).

    After reaching Downtube (which is sometimes easier than other times), it looks like (but not yet confirmed) that they sent me the hardware for the mini instead of the 9. I believed that telling them my model was sufficient.

    Cheers,
    Charles
    http://Charles.Plager.net
    http://RecumbentQuant.blogspot.com

  14. #14
    The Recumbent Quant cplager's Avatar
    Join Date
    Jan 2012
    Location
    Norwalk, CT
    My Bikes
    2012 Cruzbike Sofrider, 2013 Cruzigami Mantis
    Posts
    2,799
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    I'm still having trouble getting the right part from Downtube.


    IMAG0550.jpg


    The picture above is what it looks like when I have the cylinder installed. You can tell that there is none of the cylinder that sticks out of the whole on the bottom.


    Can somebody who has a Downtube with a similar closing mechanism try and take the same picture?


    Thanks,
    Charles
    http://Charles.Plager.net
    http://RecumbentQuant.blogspot.com

  15. #15
    Senior Member
    Join Date
    Apr 2006
    Posts
    2,152
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Recontact Downtube with a lot of pictures of the hinge area of your bike. I am assuming you bought this bike used from someone. It may in fact not be a model 9. Downtube should be able to confirm it from the pictures or the serial number. Thank god my good folder is a Bike Friday Pocket Rocket that I bought in 1994. They still have all my build details in their files. If I need something I can at least get it. Maybe the person who sold you the bike gave you wrong information. I wish you luck with this. From what I see in the picture what you have is not going to work. It may also be time to find a Downtube dealer and get them involved. Roger

    Edit: I looked at as many Downtube 9s as I could find on Google Images and those do look like the right parts. Fold the bike together and tighten the quick release and see if it holds. At least the release lines up with the slot in the front part of the frame. Again I feel a dealer might be your best option on this one. Roger
    Last edited by rhenning; 11-12-12 at 05:56 PM.

  16. #16
    Senior Member
    Join Date
    Aug 2005
    Location
    San Rafael, California
    Posts
    1,500
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by cplager View Post
    I'm still having trouble getting the right part from Downtube.


    IMAG0550.jpg


    The picture above is what it looks like when I have the cylinder installed. You can tell that there is none of the cylinder that sticks out of the whole on the bottom.


    Can somebody who has a Downtube with a similar closing mechanism try and take the same picture?


    Thanks,
    Charles
    Is the cylinder in upside down? Is the hole that the threads goes through in the center of the cylinder (equidistant from the ends)? I had an 8FS with basically the same hinge, but I never had to take it apart.. there should be protrusion in the relaxed position, and then you would have to lift up on the q/r handle to disengage .. it's a secondary lock just incase the primary q/r fails.. isn't really needed, but is nice for peace of mind..
    Attached Images Attached Images

  17. #17
    The Recumbent Quant cplager's Avatar
    Join Date
    Jan 2012
    Location
    Norwalk, CT
    My Bikes
    2012 Cruzbike Sofrider, 2013 Cruzigami Mantis
    Posts
    2,799
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Hi Bruce,

    Quote Originally Posted by BruceMetras View Post
    Is the cylinder in upside down? Is the hole that the threads goes through in the center of the cylinder (equidistant from the ends)? I had an 8FS with basically the same hinge, but I never had to take it apart.. there should be protrusion in the relaxed position, and then you would have to lift up on the q/r handle to disengage .. it's a secondary lock just incase the primary q/r fails.. isn't really needed, but is nice for peace of mind..
    Unfortunately, it's not upside down. The cylinder is too short. Thank you - your description confirms that my understanding of the mechanism is correct.

    Thanks,
    Charles
    http://Charles.Plager.net
    http://RecumbentQuant.blogspot.com

  18. #18
    Senior Member
    Join Date
    Aug 2005
    Location
    San Rafael, California
    Posts
    1,500
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by cplager View Post
    Hi Bruce,



    Unfortunately, it's not upside down. The cylinder is too short. Thank you - your description confirms that my understanding of the mechanism is correct.

    Thanks,
    Charles
    Well, that's weird then.. I've dealt with Yan a lot back in the day, he seemed to know his stuff and always was pleasant ... but errors happen.. if you wanted to get creative, you could measure the cylinder and then head down to the hardware store.. most well equipped stores have bar stock in brass, aluminum, or steel .. you might be able to get close without having to chuck it up in a lathe or drill press.. .. just random thoughts... my money is on Yan taking care of you..

  19. #19
    The Recumbent Quant cplager's Avatar
    Join Date
    Jan 2012
    Location
    Norwalk, CT
    My Bikes
    2012 Cruzbike Sofrider, 2013 Cruzigami Mantis
    Posts
    2,799
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    H i Bruce,

    Quote Originally Posted by BruceMetras View Post
    Well, that's weird then.. I've dealt with Yan a lot back in the day, he seemed to know his stuff and always was pleasant ... but errors happen.. if you wanted to get creative, you could measure the cylinder and then head down to the hardware store.. most well equipped stores have bar stock in brass, aluminum, or steel .. you might be able to get close without having to chuck it up in a lathe or drill press.. .. just random thoughts... my money is on Yan taking care of you..
    I hope your right, but I'm becoming less optimistic. It's now been three weeks, and they've mailed me the wrong part twice. Yan himself is in the Bahamas (although they've routed the Pennsylvania phone number there; this also means that he can't ship me the parts directly and needs to get somebody else to do it). He's very friendly, but I was not particularly impressed when I was asking him details about how this was supposed to work, etc (e.g., that, yes, the cylinder is supposed to lock the other side of the frame and then you fasten the quick release).

    I may try a hardware store eventually, but the problem is that it is not a solid cynlinder, but the end (last 1/2 cm) has been machined so the diameter is smaller. And then there's getting the hole in the right place. I'm willing to bet I may be able to get close enough, but I'd need to find a machine shop that can help me out.

    Cheers,
    Charles
    http://Charles.Plager.net
    http://RecumbentQuant.blogspot.com

  20. #20
    The Recumbent Quant cplager's Avatar
    Join Date
    Jan 2012
    Location
    Norwalk, CT
    My Bikes
    2012 Cruzbike Sofrider, 2013 Cruzigami Mantis
    Posts
    2,799
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Update: For what it's worth, I gave up. I was able to return the bike in its original state and get my money back (I had bought it at a good price knowing what it's state was).

    Yan told me he'd be back in the states in a month and that he was sure he could sort me out then. He didn't sound optimistic (to me) that he'd get it sorted sooner.

    Cheers,
    Charles
    http://Charles.Plager.net
    http://RecumbentQuant.blogspot.com

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •