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Dahon Launch second generation hinge

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Dahon Launch second generation hinge

Old 07-18-23, 01:21 PM
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Dahon Launch second generation hinge

It seems that Dahon has a new version of the Launch hinge. Instead of the serrated engagement teeth that extends all the way to the exterior of the hinge, it is now smooth teeth and is hidden inside.<br /><br /><img src="https://cimg6.ibsrv.net/gimg/bikeforums.net-vbulletin/2000x1563/untitled_1_jpga_fca308f5d1d718e3bfd3d2f3db0414f3ccdfa460.jpg"></img><br /><br /><a href="https://youtu.be/9w23adDuEmM">https://youtu.be/9w23adDuEmM</a>
https:// youtu .be/ 9w23adDuEmM
<br /><br /><a href="https://youtu.be/ibLo7sYruow">https://youtu.be/ibLo7sYruow</a>
https:// youtu .be/ ibLo7sYruow
<br /><br /><a href="https://www.dahon.com.hk/products/dahon-archer-pro-folding-bike-kba005-black-20-jaws-hinge">https://www.dahon.com.hk/products/dahon-archer-pro-folding-bike-kba005-black-20-jaws-hinge</a><br /><br /><a href="https://www.dahon.com.hk/products/dahon-launch-d8-8%E9%80%9F%E7%A2%9F%E5%89%8E%E6%8A%98%E7%96%8A%E8%BB%8A-kba083-8spd%E6%9A%B4%E9%BE%8D%E6%8E%A5%E9%A0%AD">https://www.dahon.com.hk/products/dahon-launch-d8-8%E9%80%9F%E7%A2%9F%E5%89%8E%E6%8A%98%E7%96%8A%E8%BB%8A-kba083-8spd%E6%9A%B4%E9%BE%8D%E6%8E%A5%E9%A0%AD</a><br /><br />There are 2 models, one is called Launch D8 KBA083, and another one is Archer Pro KBA005.<br />There are other Launch models that don't have the "jaws hinge".
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Old 07-18-23, 01:26 PM
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https:// youtu .be/ 9w23adDuEmM
https:// youtu .be/ ibLo7sYruow

https://www.dahon.com.hk/products/da...8E%A5%E9%A0%AD

https://www.dahon.com.hk/products/da...-20-jaws-hinge
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Old 07-18-23, 06:36 PM
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How about actually sharing the video next time,... (the second one I couldn't locate)

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Old 07-18-23, 09:10 PM
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Originally Posted by tds101
How about actually sharing the video next time,... (the second one I couldn't locate)

https://www.youtube.com/watch?v=9w23adDuEmM
Interesting down "tube". There was a manufacturer in the late 80s/early 90s that used cables for the downtube as well based on the idea that a typical downtube operates primarily in tension.
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Old 07-19-23, 06:57 AM
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Originally Posted by tds101
How about actually sharing the video next time,... (the second one I couldn't locate)

https://www.youtube.com/watch?v=9w23adDuEmM
If you look at both of my posts, I did share the video, so I'm not sure what you mean.
There is a bug in the forums that hides the iFrame of youtube videos in the post, and then if you try to edit the post, it inserts the HTML tags.
If you look at my original post, you can see the video URL in between the HTML tags.
If you look at my second post, you can see the video URL clearly with spaces inserted to prevent loading the buggy iFrame.
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Old 07-19-23, 07:02 AM
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Originally Posted by tds101
How about actually sharing the video next time,... (the second one I couldn't locate)

https://www.youtube.com/watch?v=9w23adDuEmM
And how about you actually share the video too? I don't see it in your post.

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Old 07-19-23, 09:35 AM
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Originally Posted by tomtomtom123
And how about you actually share the video too? I don't see it in your post.


It was shared by me. Either you're using the controls on top of the comment box incorrectly, using an add blocker, or you're using the wrong format. Otherwise the issue is on your part.
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Old 07-19-23, 10:43 AM
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Originally Posted by john m flores
Interesting down "tube".
The "Deltec" cable. Dahon claims great things about strength and pedaling efficiency based on testing (results advertised but details not yet made public.)

There was a manufacturer in the late 80s/early 90s that used cables for the downtube as well based on the idea that a typical downtube operates primarily in tension.
Bike frames with tension cable members: Dursley-Pedersen, 1890s.
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Old 07-21-23, 09:04 AM
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I'm interested to know whether the newer hinge design without the serrated teeth and a recessed edge, has any benefit over the older design, other than ingress of water/dirt.
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Old 07-21-23, 11:01 AM
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Originally Posted by tcs
The "Deltec" cable. Dahon claims great things about strength and pedaling efficiency based on testing (results advertised but details not yet made public.)



Bike frames with tension cable members: Dursley-Pedersen, 1890s.
This is the one I was thinking of, Slingshot
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Old 07-21-23, 11:12 AM
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It seems like it is hard to beat a welded triangle designed bike.
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Old 07-22-23, 01:13 PM
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Originally Posted by tomtomtom123
It seems that Dahon has a new version of the Launch hinge. Instead of the serrated engagement teeth that extends all the way to the exterior of the hinge, it is now smooth teeth and is hidden inside.<br /><br /><img src="https://cimg6.ibsrv.net/gimg/bikeforums.net-vbulletin/2000x1563/untitled_1_jpga_fca308f5d1d718e3bfd3d2f3db0414f3ccdfa460.jpg"></img><br /><br /><a href="https://youtu.be/9w23adDuEmM">https://youtu.be/9w23adDuEmM</a>
https:// youtu .be/ 9w23adDuEmM
<br /><br /><a href="https://youtu.be/ibLo7sYruow">https://youtu.be/ibLo7sYruow</a>
https:// youtu .be/ ibLo7sYruow
<br /><br /><a href="https://www.dahon.com.hk/products/dahon-archer-pro-folding-bike-kba005-black-20-jaws-hinge">https://www.dahon.com.hk/products/dahon-archer-pro-folding-bike-kba005-black-20-jaws-hinge</a><br /><br /><a href="https://www.dahon.com.hk/products/dahon-launch-d8-8%E9%80%9F%E7%A2%9F%E5%89%8E%E6%8A%98%E7%96%8A%E8%BB%8A-kba083-8spd%E6%9A%B4%E9%BE%8D%E6%8E%A5%E9%A0%AD">https://www.dahon.com.hk/products/dahon-launch-d8-8%E9%80%9F%E7%A2%9F%E5%89%8E%E6%8A%98%E7%96%8A%E8%BB%8A-kba083-8spd%E6%9A%B4%E9%BE%8D%E6%8E%A5%E9%A0%AD</a><br /><br />There are 2 models, one is called Launch D8 KBA083, and another one is Archer Pro KBA005.<br />There are other Launch models that don't have the "jaws hinge".
Let me take a wack at it:



I've got mixed feelings.
Dahon finally has disk brakes, FINALLY upgraded the hinge (which I'll wait until the second iteration).

But that cable....
ugh!
Nothing says "we have no faith in our own frames" than an after thought structural cable.
(possible lawsuit induced?)

I'll likely on my last Dahon, and when it goes.... [not sure yet]

Edit:
Looked at the hinge. Clamp on the bottom and a bolt neat the top. hmmmm... I'd have to see it up close.
At lease the frame is finally strengthened around the hinge.

Edit edit:
Better bottom bracket, more contact surface area for the hinge.
When it folds the cable makes it ugly. (yikes)
The underneath locking mechanism is a welcome change.

Last edited by CrimsonEclipse; 07-22-23 at 01:25 PM.
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Old 07-22-23, 05:18 PM
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Originally Posted by CrimsonEclipse
Dahon finally has disk brakes.
Dahon Cadenza, Jetstream, Ios, K, models of the Mu. Last ten years.

Of course in your analysis, going to discs means they have no faith in their rim brakes...
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Old 07-22-23, 09:55 PM
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Originally Posted by tcs
Dahon Cadenza, Jetstream, Ios, K, models of the Mu. Last ten years.

Of course in your analysis, going to discs means they have no faith in their rim brakes...
Rim brakes are hot garbage
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Old 07-23-23, 05:10 AM
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Originally Posted by CrimsonEclipse
Rim brakes are hot garbage
I'll take disc brakes over rim any day. 👍
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Old 07-23-23, 09:33 AM
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[QUOTE

Of course in your analysis, going to discs means they have no faith in their rim brakes...[/QUOTE]

Granted disks provide more power ,it’s also a marketing benefit. Having disk brakes give’s the bike more high end appeal.
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Old 07-23-23, 09:40 AM
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Originally Posted by tds101
I'll take disc brakes over rim any day. 👍
A
Disk do offer more braking power but at an additional cost vs v-brakes. The later are still adequate for many situations. The bike industry likes them for the extra profits from disk replacement and bike shop for the maintenance. I have both and well adjusted v brakes with koolstop pads provide very strong braking power. Going down the Alps is another thing…😀
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Old 07-23-23, 12:27 PM
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Originally Posted by jfouellette
A
Disk do offer more braking power but at an additional cost vs v-brakes. The later are still adequate for many situations. The bike industry likes them for the extra profits from disk replacement and bike shop for the maintenance. I have both and well adjusted v brakes with koolstop pads provide very strong braking power. Going down the Alps is another thing…😀
I've never had rim brakes last longer than disc. And in the long term disc are less expensive (in my experience). Rim brakes not only require pad replacement, they also end up needing rims to be replaced. The pads wear away the rims. I'll swap pads/discs anytime. Especially for the added security of stopping power on hills, and during inclement weather riding.
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Old 07-27-23, 02:23 AM
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Originally Posted by CrimsonEclipse
Let me take a wack at it:

https://www.youtube.com/watch?v=ibLo7sYruow


I've got mixed feelings.
Dahon finally has disk brakes, FINALLY upgraded the hinge (which I'll wait until the second iteration).

But that cable....
ugh!
Nothing says "we have no faith in our own frames" than an after thought structural cable.
(possible lawsuit induced?)

I'll likely on my last Dahon, and when it goes.... [not sure yet]

Edit:
Looked at the hinge. Clamp on the bottom and a bolt neat the top. hmmmm... I'd have to see it up close.
At lease the frame is finally strengthened around the hinge.

Edit edit:
Better bottom bracket, more contact surface area for the hinge.
When it folds the cable makes it ugly. (yikes)
The underneath locking mechanism is a welcome change.
This is their second version of the hinge design. But I think the main difference is only the engagement of the teeth on the "jaws". I think the teeth are now hidden behind a flange to reduce chance of damaging them. I would imagine banging the teeth against something while folded and then they no longer mate.

I would assume most of the bending load still goes to the pin on the left side.
But the jaws reduce the load on the pin by making the connection more stiff.

The problem with the other hinge designs is that the right side was just a single point connection in tension, and flexed like a see-saw.

Last edited by tomtomtom123; 07-27-23 at 02:27 AM.
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