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Old 10-21-12, 02:49 PM   #1
cplager
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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.
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Old 10-21-12, 02:58 PM   #2
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I would get hold of Yan at Downtube.
http://www.downtube.com/
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Old 10-21-12, 05:47 PM   #3
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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
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Old 10-21-12, 06:53 PM   #4
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For the handlebar
http://www.ebay.com/itm/31cm-Length-...item460879203e
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Old 10-22-12, 06:30 AM   #5
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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
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Old 10-22-12, 06:39 AM   #6
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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
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Old 10-22-12, 11:40 AM   #7
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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
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Old 10-22-12, 07:11 PM   #8
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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
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Old 10-28-12, 05:37 PM   #9
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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
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Old 10-29-12, 07:58 PM   #10
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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
File Type: jpg clamp#1.jpg (53.2 KB, 9 views)
File Type: jpg clamp#2.jpg (44.7 KB, 10 views)
File Type: jpg clamp#3.jpg (55.9 KB, 12 views)
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Old 10-30-12, 07:18 AM   #11
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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
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Old 10-30-12, 11:03 AM   #12
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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
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Old 10-30-12, 11:08 AM   #13
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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
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Old 11-12-12, 06:07 PM   #14
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I'm still having trouble getting the right part from Downtube.





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
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File Type: jpg IMAG0550.jpg (64.2 KB, 24 views)
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Old 11-12-12, 06:46 PM   #15
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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 06:56 PM.
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Old 11-12-12, 07:16 PM   #16
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Quote:
Originally Posted by cplager View Post
I'm still having trouble getting the right part from Downtube.





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..
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Old 11-12-12, 07:33 PM   #17
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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
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Old 11-12-12, 10:45 PM   #18
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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..
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Old 11-13-12, 06:45 AM   #19
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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
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Old 11-14-12, 07:13 AM   #20
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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
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